if pb 2(aq) is controlled by the solubility of pb(oh)2, what pb 2(aq) concentration is expected if ph=poh=7.00? b. what ph would be required to lower pb 2(aq) to 2.07 ppb?
Answers
If pH=pOH=7.00 and the solubility of Pb(OH)₂ controls Pb²⁺(aq), the expected concentration of Pb²⁺(aq) is (a) 1.2 x 10⁻¹⁵ M and to lower Pb²⁺(aq) concentration to 2.07 ppb, a pH of (b) 9.05 is required.
a) When Pb(OH)₂ dissolves in water, it dissociates into Pb²⁺ and 2 OH⁻ ions. The solubility of Pb(OH)₂ is pH-dependent, as it is an ionic compound that can undergo acid-base reactions in aqueous solution.
At a certain pH, the concentrations of Pb²⁺ and OH⁻ are in equilibrium with the solid Pb(OH)₂, which is said to be "controlled" by its solubility.
If pH=pOH=7.00, then [OH⁻] = 10⁻⁷ M. Assuming that all the OH⁻ ions come from the dissociation of Pb(OH)₂, the concentration of Pb²⁺ can be calculated using the solubility product constant (Ksp) for Pb(OH)₂, which is 2.0 x 10⁻¹⁵:
Ksp = [Pb²⁺][OH⁻]²
2.0 x 10⁻¹⁵ = [Pb²⁺](10⁻¹⁴)
[Pb²⁺] = 2.0 x 10⁻¹⁵ / 10⁻¹⁴
[Pb²⁺] = 1.2 x 10⁻¹⁵ M
Therefore, the expected concentration of Pb²⁺(aq) is 1.2 x 10⁻¹⁵ M.
b) To lower the concentration of Pb²⁺(aq) to 2.07 ppb, we need to convert this value to molarity:
2.07 ppb = 2.07 x 10⁻⁹ g/L
Assuming a molar mass of 207.2 g/mol for Pb, this is equivalent to:
2.07 x 10⁻⁹ g/L / 207.2 g/mol = 1.0 x 10⁻¹¹ M
Now, we can use the same equilibrium expression as before and solve for [OH⁻]:
Ksp = [Pb²⁺][OH⁻]²
2.0 x 10⁻¹⁵ = (1.0 x 10⁻¹¹) [OH⁻]²
[OH⁻] = √(2.0 x 10⁻¹⁵ / (1.0 x 10⁻¹¹))
[OH⁻] = 4.5 x 10⁻³ M
Finally, we can use the relationship between pH and [OH⁻] to calculate the required pH:
pOH = -log[OH⁻] = -log(4.5 x 10⁻³) = 2.35
pH + pOH = 14
pH = 14 - 2.35 = 11.65
Therefore, a pH of 9.05 is required to lower the concentration of Pb²⁺(aq) to 2.07 ppb.
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Related Questions
plz help for braniliest
Answers
Answer: i think b.
Explanation:
Why do plant animal cells both have mitochondria?
Answers
Answer:
They both need mitochondria for cellular respiration
Explanation:
hope this helps :)
PLEASE HELP. DUE TODAY
1. An atom with a _____ charge has the same number of protons and electrons.
2. An atom that has a different number of electrons and protons is called a(n) ____.
2. T or F? All atoms in an element contain an identical number of neutrons.
Answers
Answer:
Explanation:
1.An atom with a neutral charge are expected to have the same number of electrons and protons from Henry assumption (1914).
2. An atom with different number of electrons and protons are charge atom and they are called ion.
3. Yes.
Question 8 of 35
Which item rotates in a magnetic field as an electric motor produces kinetic
energy?
A. Permanent magnet
B. Loop of wire
C. Lightbulb
D. Battery
SUBMIT
Answers
You can download answer here
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In a short paragraph, explain one thing you've learned from the course this year.
Answers
Answer:
ive learned about the chart , ive learned about the coolest chemicle reactions and how. the can change colors , ive also learned that chenistrey is all around us since the beginning of life ,and how liquid can turn solid
Explanation:
Consider the total ionic equation below.
Ba2+ + 2NO3 + 2Na+ + Co3 —BaCO3 + 2Na+ + 2NO3
Which is the net ionic equation for the reaction?
O Ba2+ + C03 —> BaCO3
© 2Na+ + co} → Na2CO3
NO3 + Na* —> NaNO3
O Ba2+ + 2NO3 →→ Ba(NO3)2
Answers
Answer:
Ba²⁺ + CO₃²⁻ → BaCO₃
Explanation:
A net ionic equation is a way to write a chemical reaction in which you list only the species that are participating in the reaction.
For the reaction:
Ba²⁺ + 2NO₃ + 2Na⁺ + CO₃²⁻ → BaCO₃ + 2Na⁺ + 2NO₃
As you can see, NO₃ and Na⁺ are not participating in the reaction. Thus, net ionic equaation is:
Ba²⁺ + CO₃²⁻ → BaCO₃
Complete Question
Consider the total ionic equation below.
\(Ba^{2+} + 2NaO_3^{1 -} + 2Na^{+} + CO_3^{2-} ----> BaCO_3 + 2Na^{+} + 2NO_3^{1-}\)
Which is the net ionic equation for the reaction?
A \(Ba^{2+} _{(aq)} + CO_3 ^{2-} _{(aq)} ----> BaCO_3_{(s)}\)
B \(2Na^+ + CO_2 ----> Na2CO3\)
C \(NO3 + Na ^ + ----> NaNO3\)
D \(Ba_2^+ + 2NO3 ----> Ba(NO3)2\)
Answer:
Option A is the correct option
Explanation:
The given ionic equation is
\(Ba^{2+} + 2NaO_3^{1 -} + 2Na^{+} + CO_3^{2-} ----> BaCO_3 + 2Na^{+} + 2NO_3^{1-}\)
Looking at this complete ionic equation we see that \(Na^{+1} \ and \ NO_3^{1-}\) did not change in the reaction so they will not be included in the net ionic equation so the net ionic equation becomes
\(Ba^{2+} _{(aq)} + CO_3 ^{2-} _{(aq)} ----> BaCO_3_{(s)}\)
5. Identify one environmental problem caused by
nitrogen dioxide, NO2. Suggest two things that
you can do to help reduce this problem.
Answers
Answer:
High levels of nitrogen dioxide are also harmful to vegetation—damaging foliage, decreasing growth or reducing crop yields. Nitrogen dioxide can fade and discolour furnishings and fabrics, reduce visibility, and react with surfaces.
1-We could use low-nitrogen fuels
2- We could also modify combustion conditions to generate less NOx. Flue gas treatment techniques, such as selective cata- lytic reduction (SCR) processes, can remove NOx
the solid baso4 is collected, dried, and found to have a mass of 2.54 g . determine the percent yield.
Answers
1.09% is the percent yield as the solid baso4 is collected, dried, and found to have a mass of 2.54 g .
Define yield.
A chemical reaction's yield is determined by the ratio of the amount of product to the amount of reactant. most often represented as a percentage. Moles of product = % Yield.
The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield. The percent yield is 100% if the theoretical and actual yields are equal.
The mass in grams of one mole of a chemical is its molar mass. A mole is the measurement of the number of things, such as atoms, molecules, and ions, that are present in a substance.
Molar mass of BaSO4 is 233 g/mol
Given mass is 2.54g
Percent yield will be 2.54/233 *100 i.e. 1.09%
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When chlorine gas comes into contact with magnesium metal at high temperatures, solid magnesium chloride is created. Classify this reaction.
Answers
The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.
Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.
The balanced chemical equation for this synthesis reaction is:
Mg + Cl₂ ⇒ MgCl₂
Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.
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The mole concept - converting between mass and number of atoms
How many copper atoms are in a copper penny with a mass of 3.10g? (Assume that the penny is composed of pure copper.)
Answers
There are approximately 2.94 x 10^22 copper atoms in a copper penny with a mass of 3.10g. To calculate the number of copper atoms in a copper penny with a mass of 3.10g, follow these steps:
1. Determine the molar mass of copper: Copper (Cu) has a molar mass of approximately 63.55 g/mol.
2. Convert the mass of the penny into moles: Divide the mass of the penny (3.10g) by the molar mass of copper (63.55 g/mol).
Moles of copper = 3.10g / 63.55 g/mol = 0.0488 moles
3. Use Avogadro's number to convert moles to atoms: Avogadro's number is approximately 6.022 x 10^23 atoms/mol. Multiply the moles of copper by Avogadro's number to find the number of copper atoms.
Number of copper atoms = 0.0488 moles * 6.022 x 10^23 atoms/mol = 2.94 x 10^22 atoms
So, there are approximately 2.94 x 10^22 copper atoms in a copper penny with a mass of 3.10g, assuming it is composed of pure copper.
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a. For the reaction 2H2 + 02→ 2H20, how many moles of water can be produced from 6.0 mol of oxygen? 2.0 mol b. 6.0 mol 12 mol d. 18 mol
Answers
Explanation:
from the equation 1 mole of O2 will give 2 moles of H2O then 6.0 moles of O2 will give x
6.0*2 moles/ 1 mole
= 12 moles
this implies that, 6.0 moles of O2 will give = 12 moles of water
an ionized calcium atom has a charge of 2 elementary charges. if this ion is accelerated through a potential difference of 2.0 x 10^3 volts, the ion's change in kinetic energy will be
Answers
The ion's change in kinetic energy will be \(4.0 \times 10^3\;eV\)
Given the following data:
Charge = 2 Coulombs.
Potential difference = \(2.0 \times 10^3 \;Volts\)
How to calculate the ion's change in kinetic energy.Mathematically, kinetic energy of a charge is given by this formula:
\(K.E = qV\)
Where:
K.E is the kinetic energy.q is the charge.V is the potential difference.Substituting the given parameters into the formula, we have;
\(K.E = 2 \times 2.0 \times 10^3 \\\\K.E = 4.0 \times 10^3\;eV\)
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Why do we feel the heat from the sun even though it is far away from Earth?
O The sun is farther away from Earth than any other star.
The sun is closer to Earth than any other star.
O The sun is the largest star.
O The sun is the brightest star.
Answers
Answer:
B.) The sun is closer to Earth than any other star.
from the given element Na,P,Ca and Br whice one has the highest ionization energy
Answers
Answer:
The pattern for ionization energy is that it increases as you move left to right. Therefore, P has the highest ionization energy.
Explanation:
which sentence is preferable?select an answer:solvent use will not exceed 5,000 gallons per month.solvents should be limited in use to 5,000 gallons per month.solvent usage should be optimized at 5,000 gallons per month.solvent usage will be restricted if 5,000 gallons are needed in any given month.
Answers
The sentence "Solvent use will not exceed 5,000 gallons per month" is the most preferable.
It is clear and direct, and avoids any ambiguity or confusion. With a word count of only 9 words, it is also concise and to the point. The other sentences could be interpreted in different ways, and may not convey the same level of certainty and clarity as the first option. Therefore, when communicating important information about solvent use, it is best to keep it simple and straightforward. The preferable sentence among the given options is: "Solvent use will not exceed 5,000 gallons per month." This sentence is clear, concise, and provides a specific limit for solvent usage. The other sentences are less direct or imply a different meaning, such as suggesting optimization or imposing restrictions only if the specified amount is needed. By stating that solvent use will not exceed a certain amount, it establishes a firm boundary and ensures that the intended message is effectively communicated.
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Use the formula to answer the following question4Li + Pb(SO4)2->2Li₂SO4 + PbHow many moles of Pb(SO4)2 are needed to produce 330 g Li₂SO4?
Answers
ANSWER
The number of moles of Pb(SO4)2 is 1.5 moles
EXPLANATION
Given that;
The mass of Li2SO4 is 330g
Follow the steps below to find the moles of Pb(SO4)2
Step 1; Write the balanced equation of the reaction
\(\text{ 4Li + Pb\lparen SO}_4)_2\rightarrow\text{ 2Li}_2SO_4\text{ + Pb}\)Step 2; Find the number of moles of Li2SO4 using the below formula
\(\text{ Mole = }\frac{\text{ mass}}{\text{ molar mass}}\)Recall, that the molar mass of Li2SO4 is 109.94 g/mol
\(\begin{gathered} \text{ mole = }\frac{\text{ 330}}{\text{ 109.94}} \\ \text{ mole = 3.00 moles} \end{gathered}\)The number of moles of Li2SO4 is 3.00 moles
Step 3; Find the number of moles of Pb(SO4)2 using a stoichiometry ratio
In the above equation of the reaction, 1 mole Pb(SO4)2 reacts to give 2 moles LiSO4
Let the number of moles of Pb(SO4) be x
\(\begin{gathered} \text{ 1 mole Pb\lparen SO}_4)_2\text{ }\rightarrow\text{ 2 moles Li}_2\text{SO}_4 \\ \text{ x moles Pb\lparen SO}_4)_2\text{ }\rightarrow\text{ 3.00 moles Li}_2SO_4 \\ \text{ Cross multiply} \\ \text{ 1 mole Pb\lparen SO}_4)_2\text{ }\times\text{ 3 .00 moles Li}_2SO_4\text{ = 2 moles Li}_2SO_4\text{ }\times\text{ x moles Pb\lparen SO}_4)_2 \\ \text{ Isolate x} \\ \text{ x = }\frac{\text{ 1 mole Pb\lparen SO}_4)_2\times3moles\cancel{Li_2}SO_4}{2moles\cancel{Li_2}SO_4} \\ \text{ x = }\frac{1\text{ }\times\text{ 3}}{2} \\ \text{ x = }\frac{3}{2} \\ \text{ x = 1.5 moles} \end{gathered}\)Therefore, the number of moles of Pb(SO4)2 is 1.5 moles
Water has a large number of unique properties that make it essential for our survival. Many of these properties can not exist without the others. Explain how the properties of cohesion, adhesion, capillary action, and polarity contribute to the ability of a plant to take in water through it's roots
Answers
The properties of cohesion, adhesion, capillary action, and polarity are important properties of water. These properties enable water to travel up the plant stem against gravity, leading to the plant being able to absorb water through its roots.
Water is a vital component of plant life. It is a source of nutrients and helps plants to carry out photosynthesis. Cohesion, adhesion, capillary action, and polarity are unique properties of water that are important in this process.Cohesion refers to the ability of water molecules to stick together. This is important because when water molecules stick together, they create a surface tension that helps water to maintain its shape.
This surface tension enables water to be drawn up the plant stem.Adhesion refers to the ability of water molecules to stick to other surfaces. This is important because when water sticks to the sides of the plant stem, it helps to hold the water in place, allowing the plant to absorb water through its roots.Capillary action refers to the ability of water to move through small spaces.
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The term coordinate covalent bond best fits which of the following descriptions? Select the correct answer below: a. A coordinate covalent bond is a bond in which each atom contributes one of the two bonding electrons, b. A coordinate covalent bond is an attractive force between the hydrogen attached to an electronegative atom of one molecule and an electronegative atom of a different molecule. c. A coordinate covalent bond is a bond in which one atom supplies both of the shared electrons in the bond. d. A coordinate covalent bond is the term for the electrostatic attraction binding two ions together
Answers
The term coordinate covalent bond is best described as option C: "A coordinate covalent bond is a bond in which one atom supplies both of the shared electrons in the bond."
In a coordinate covalent bond, one of the atoms involved in the bond donates both of the electrons needed for the bond formation, while the other atom does not contribute any electrons. This type of bond can also be referred to as a dative bond or a Lewis acid-base bond.
Option A is the definition of a regular covalent bond, where both atoms contribute one electron to form the bond. Option B is describing a hydrogen bond, which is a weak force of attraction between a hydrogen atom in one molecule and a highly electronegative atom in another molecule.
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what does combustion mean
Answers
Answer:
combustion is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
How many formula units are in 2.0 moles of Fe(NO3)2?
Answers
Answer:
1.2 x 10>24 (2.0)(6.022 x 10>23)
Explanation:
How many formula units are in 2.0 moles of Fe(NO3)2?
Mole measure the number of elementary entities of a given substance that are present in a given sample. 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to molar mass.
Mathematically,
Mole of Fe(NO₃)₂. =given number of atoms of Fe(NO₃)₂.÷ 6.022×10²³(Avogadro number)
mole of Fe(NO₃)₂= 2moles
Substituting the values
2=number of atoms of Fe(NO₃)₂.÷ 6.022×10²³
Number of atoms of Fe(NO₃)₂.=2×6.022×10²³
Number of atoms of Fe(NO₃)₂.=12.044×10²³
Therefore, 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.
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Explain how to calculate net force.
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If aluminum nitrate reacts with calcium phosphite, what is the balanced coefficient of aluminum nitrate?
Answers
Answer:
The coefficient of aluminum nitrate is 2.
Explanation:
The reaction between aluminum nitrate and calcium phosphite is:
Al(NO₃)₃ + CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂
Now, we need to balance the equation. Let's begin with phosphite anion. On the reactant side we have 1 molecule of the anion, and on the products side we have 3 of it, so we need to add a coefficient of 3 before CaHPO₃:
Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂
The number of Ca atoms on the reactants side is now 3 and on the products side is 1, so we need to add a coefficient of 3 as follows:
Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂
The reactants side has 1 atom of Al, and the products side has 2. Let's add a coefficient of 2 on the reactant side:
2Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂
Finally, the nitrate anion has 6 molecules on the reactant side, which is equal to the number of molecules of NO₃⁻ on the product side.
Hence, in the balanced equation, we have a coefficient of 2 in aluminum nitrate.
I hope it helps you!
Which of the following neutral atom configurations satisfies the octet rule?
1s2 2s2 2p6 3s2 3p6
1s2 2s1
1s2 2s2 3s2 3p4
1s2 2s2 3s2 3p6 4s1
Answers
Answer:
2
Explanation:i did the test
At 161 K, SiH4 boils but SiO2 remains as a solid. Using principles of interparticle forces, explain the difference in boiling points.
Answers
The boiling point of a substance is determined by the strength of the interparticle forces between molecules.
What is boiling point?Boiling point is the temperature at which a liquid changes state from liquid to gas, also known as its vaporization point. The boiling point of water at sea level is 100°C (212°F).
In the case of SiH4, the boiling point is higher than that of SiO2 due to the stronger nature of the intermolecular forces. This is because SiH4 is held together by stronger hydrogen bonds, resulting in more energy needed to break apart the molecules. On the other hand, SiO2 is held together by weaker dipole-dipole interactions and London dispersion forces, meaning it requires less energy to break apart the molecules and thus has a lower boiling point.
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complete the statement
qxy- bxy+cxy= xy( )
Answers
Answer:
xy (-b+c+q) is the answer to this
Most all compounds that contain carbon are organic compounds. An exception is
methane
glucose
carbon dioxide
ammonia
Answers
Answer:
carbon dioxide
it is an exception
hope it helps
Calculate the concentration of In‒ in Standard B if the concentration of the NaIn stock solution is 3.6 x 10‒4 M. Standard B = 25 mL of.10 M Nh_3(aq) and 5 mL of NaIn
Answers
The concentration of In⁻ in Standard B is 6 x 10⁻⁵ M.
To calculate the concentration of In⁻ in Standard B, we can use the concept of molarity (M) and the dilution formula.
The moles of In⁻ present in the NaIn stock solution:
Moles of In⁻ = Concentration of NaIn stock solution x Volume of NaIn stock solution
Moles of In⁻ = (3.6 x 10⁻⁴ M) x (5 mL) = 1.8 x 10⁻³ moles
The total volume of Standard B:
Total volume of Standard B = Volume of .10 M NH₃ + Volume of NaIn
Total volume of Standard B = (25 mL + 5 mL) = 30 mL
The concentration of In⁻ in Standard B:
Concentration of In⁻ in Standard B = Moles of In⁻ / Total volume of Standard B
Concentration of In⁻ in Standard B = (1.8 x 10⁻³ moles) / (30 mL) = 6 x 10⁻⁵ M
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To calculate the concentration of In⁻ in Standard B, first find the number of moles of In⁻ in 5 mL of the NaIn stock solution. Then, calculate the total volume of Standard B, and finally divide the number of moles by this volume. The concentration of In⁻ in Standard B is 6.0 x 10⁻⁵ M.
Explanation:In order to calculate the concentration of In‒ in Standard B, we need to understand that the number of moles present in the stock solution will remain the same even after dilution. Concentration relates to the volume of the solution and the number of moles of the solute (NaIn) present. The volume of the diluted solution (Standard B) is calculated by adding the volume of NaIn (5 mL) and NH3 (25 mL), giving a total volume of 30 mL or 0.030 L.
According to the concept of molarity (M), which is defined as moles of solute per liter of solution, we use the given concentration of NaIn in the stock solution (3.6 x 10⁻⁴ M), which also represents the number of moles of In⁻ in 1 L of the stock solution. To find the number of moles in 5 mL (0.005 L), we multiply the molarity by the volume (3.6 x 10⁻⁴ mol/L x 0.005 L), getting 1.8 x 10⁻⁶ mol of In⁻.
The concentration of In‒ in Standard B is then determined by dividing the number of moles of In‒ by the total volume of the solution (1.8 x 10⁻⁶ mol/0.030 L), yielding a concentration of 6.0 x 10⁻⁵ M.
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preform the following mathematical operation, and report the answer to the correct number of significant figures
1.235 x 2.65 = ?
Answers
As lowest significant is 2.65
It should be rounded till second decimal
3.2733.27I’m sorry I’m confused can you help me?
Answers
Answer:
2 electrons
Explanation:
The first principal energy level contains only an s sublevel; therefore, it can hold a maximum of two electrons.
PLEASE HELP
Which reagent is the limiting reagent in a reaction?
Answers
Answer:
I believe B
Explanation:
Hope this helps