Question 1

The concentration of oxalate ion (C₂O₄^2-)in a sample can be determined by titration with a solution of permanganate ion (MnO₄^-)of known concentration.The net ionic equation for this reaction is 2MnO₄^- + 5C₂O₄^2- + 16H⁺ $\rarr$2Mn²⁺ + 8H₂O + 10CO₂ A 30.00 mL sample of an oxalate solution is found to react completely with 21.93 mL of a 0.1725 M solution of MnO₄^-.What is the oxalate ion concentration in the sample? A)0.02914 M B)0.4312 M C)0.1821 M D)0.3152 M E)0.05044 M

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Question 2

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s)+ 2HCl(aq)$\rarr$ ZnCl₂(aq)+ H₂(g) What mass of hydrogen gas is produced when a 7.35 g chunk of zinc dissolves in 500.mL of 1.200M HCl? A)0.605 g B)0.113 g C)0.302 g D)0.453 g E)0.227 g

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Question 3

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: H₃PO₄

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Question 4

One method of determining the concentration of hydrogen peroxide (H₂O₂)in a solution is through titration with the iodide ion.The net ionic equation for this reaction is H₂O₂ + 2I^- +2H⁺ $\rarr$ I₂ + 2H₂O A 50.00 mL sample of a hydrogen peroxide solution is found to react completely with 37.12 mL of a 0.1500 M KI solution.What is the concentration of hydrogen peroxide in the sample? A)5.568 × 10^-2 M B)0.2227 M C)0.1010 M D)0.4041 M E)0.1114 M

Accepted Answer

The concentration of hydrogen peroxide in the sample is 5.568 × 10^-2 M. This is because the reaction between hydrogen peroxide and iodide ions is a 1:2 reaction, meaning that 1 mole of hydrogen peroxide reacts with 2 moles of iodide ions. Therefore, the number of moles of hydrogen peroxide in the sample is equal to half the number of moles of iodide ions used in the titration. The number of moles of iodide ions used in the titration is equal to the concentration of the iodide ion solution multiplied by the volume of the solution used. Therefore, the number of moles of hydrogen peroxide in the sample is equal to:```(0.1500 M) × (37.12 mL) / 1000 mL/L = 0.005568 mol```The concentration of hydrogen peroxide in the sample is then equal to the number of moles of hydrogen peroxide divided by the volume of the sample, which is 50.00 mL. Therefore, the concentration of hydrogen peroxide in the sample is:```0.005568 mol / 0.05000 L = 5.568 × 10^-2 M```

Question 5

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s)+ 2HCl(aq)$\rarr$ZnCl₂(aq)+ H₂(g) When a 12.7 g chunk of zinc dissolves in 500.mL of 1.450M HCl, what is the concentration of hydrogen ions remaining in the final solution? A)0.776 M B)0.388 M C)0.674 M D)1.06 M E)0 M

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Question 6

A 250.mL sample of 0.0328M HCl is partially neutralized by the addition of 100.mL of 0.0245M NaOH.Find the concentration of hydrochloric acid in the resulting solution.
A)0.00700 M
B)0.0164 M
C)0.0383 M
D)0.0230 M
E)0.0575 M

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Question 7

What volume (mL)of a 0.2450 M KOH(aq)solution is required to completely neutralize 55.25 mL of a 0.5440 M H₃PO₄(aq)solution? A)30.06 mL B)165.8 mL C)90.17 mL D)22.09 mL E)368.0 mL

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Question 8

Define the terms solution, solute, and solvent.

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Question 9

When solid iron(II)hydroxide is added to water, the resulting solution contains 1.4×10^-3g of dissolved iron(II)hydroxide per liter of solution.What is the hydroxide ion concentration in this solution? A)7.8×10^-6 M B)1.6×10^-5 M C)2.5×10^-10 M D)3.1×10^-5 M E)4.0×10^-3 M

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Question 10

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: H₂CO₃

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Question 11

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH₃COOH.

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Question 12

When 50.0 mL of a 0.3000 M AgNO₃ solution is added to 50.0 mL of a solution of MgCl₂, an AgCl precipitate forms immediately.The precipitate is then filtered from the solution, dried, and weighed.If the recovered AgCl is found to have a mass of 0.1183 g, what as the concentration of magnesium ions in the original MgCl₂ solution? A)0.300 M B)8.25 × 10^-3 M C)1.65 × 10^-2 M D)2.06 × 10^-5 M E)4.13 × 10^-3 M

Accepted Answer

The balanced chemical equation for the reaction is:2AgNO3(aq) + MgCl2(aq) → 2AgCl(s) + Mg(NO3)2(aq)From the stoichiometry of the balanced chemical equation, we can see that 2 moles of AgNO3 react with 1 mole of MgCl2. Therefore, the concentration of MgCl2 in the original solution can be calculated as follows:[MgCl2] = (0.3000 M AgNO3)(50.0 mL AgNO3 solution)/(2)(50.0 mL MgCl2 solution) = 0.01500 MTherefore, the concentration of magnesium ions in the original MgCl2 solution is 8.25 × 10-3 M.

Question 13

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide.What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750.mL of water?
A)1.06 M
B)0.528 M
C)2.11 M
D)0.792 M
E)0.943 M

Accepted Answer

Lithium reacts with water in a 2:2 ratio to form lithium hydroxide and hydrogen gas. The molar mass of lithium is approximately 6.94 g/mol, so 5.500 g of lithium is about 0.792 mol. Since the reaction ratio is 2:2, this produces 0.792 mol of hydroxide ions in 750 mL (or 0.75 L) of water, resulting in a concentration of $ \frac{0.792 \, \text{mol}}{0.75 \, \text{L}} = 1.056 \, \text{M} $, which rounds to 1.06 M.

Question 14

A 350.mL sample of 0.276M HNO₃ is partially neutralized by 125 mL of 0.0120M Ca(OH)₂.Find the concentration of nitric acid in the resulting solution. A)0.210 M B)0.00632 M C)0.203 M D)0.0240 M E)0.197 M

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Question 15

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH₃OH (methanol).

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Question 16

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH₃.

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Question 17

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: Al(NO₃)₃

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Question 18

What volume (mL)of a 0.3428 M HCl(aq)solution is required to completely neutralize 23.55 mL of a 0.2350 M Ba(OH)₂(aq)solution? A)55.34 mL B)11.07 mL C)16.14 mL D)32.29 mL E)47.10 mL

Accepted Answer

The balanced chemical equation for the reaction between HCl and Ba(OH)2 is: HCl + Ba(OH)2 → BaCl2 + 2H2O. This shows that 2 moles of HCl are needed to neutralize 1 mole of Ba(OH)2. Using the molarity and volume of Ba(OH)2, we find the moles of Ba(OH)2: (0.2350 M)(0.02355 L) = 0.00553825 moles. Since the mole ratio of HCl to Ba(OH)2 is 2:1, we need 2 * 0.00553825 = 0.0110765 moles of HCl. Using the molarity of HCl to find the volume needed: Volume = moles / molarity = 0.0110765 moles / 0.3428 M = 0.03229 L, which is 32.29 mL.

Question 19

When 20.0 mL of a 0.250 M (NH₄)₂S solution is added to 150.0 mL of a solution of Cu(NO₃)₂, a CuS precipitate forms.The precipitate is then filtered from the solution, dried, and weighed.If the recovered CuS is found to have a mass of 0.3491 g, what was the concentration of copper ions in the original Cu(NO₃)₂ solution? A)3.65 × 10^-3 M B)1.22 × 10^-2 M C)3.33 × 10^-2 M D)4.87 × 10^-2 M E)2.43 × 10^-2 M

Accepted Answer

The mass of CuS can be used to find the moles of CuS, which equals the moles of Cu²⁺ initially present. The molar mass of CuS is approximately 95.61 g/mol. Moles of CuS = 0.3491 g / 95.61 g/mol = 0.00365 mol. The total volume of the solution is 170.0 mL (20.0 mL + 150.0 mL). The concentration of Cu²⁺ is 0.00365 mol / 0.150 L = 0.0243 M.

Question 20

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH₄NO₃

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Quiz 4: Reactions in Aqueous Solutions

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s) + 2HCl(aq) $\rarr$ ZnCl₂(aq) + H₂(g) What mass of hydrogen gas is produced when a 7.35 g chunk of zinc dissolves in 500.mL of 1.200M HCl?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: H₃PO₄

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s) + 2HCl(aq) $\rarr$ ZnCl₂(aq) + H₂(g) When a 12.7 g chunk of zinc dissolves in 500.mL of 1.450M HCl, what is the concentration of hydrogen ions remaining in the final solution?

A 250.mL sample of 0.0328M HCl is partially neutralized by the addition of 100.mL of 0.0245M NaOH.Find the concentration of hydrochloric acid in the resulting solution.

What volume (mL) of a 0.2450 M KOH(aq) solution is required to completely neutralize 55.25 mL of a 0.5440 M H₃PO₄(aq) solution?

Define the terms solution, solute, and solvent.

When solid iron(II) hydroxide is added to water, the resulting solution contains 1.4×10^-3g of dissolved iron(II) hydroxide per liter of solution.What is the hydroxide ion concentration in this solution?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: H₂CO₃

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH₃COOH.

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide.What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750.mL of water?

A 350.mL sample of 0.276M HNO₃ is partially neutralized by 125 mL of 0.0120M Ca(OH) ₂.Find the concentration of nitric acid in the resulting solution.

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH₃OH (methanol).

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH₃.

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: Al(NO₃)₃

What volume (mL) of a 0.3428 M HCl(aq) solution is required to completely neutralize 23.55 mL of a 0.2350 M Ba(OH) ₂(aq) solution?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH₄NO₃

Quiz 4: Reactions in Aqueous Solutions

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s) + 2HCl(aq) →\rarr→ ZnCl2(aq) + H2(g) What mass of hydrogen gas is produced when a 7.35 g chunk of zinc dissolves in 500.mL of 1.200M HCl?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: H3PO4

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s) + 2HCl(aq) →\rarr→ ZnCl2(aq) + H2(g) When a 12.7 g chunk of zinc dissolves in 500.mL of 1.450M HCl, what is the concentration of hydrogen ions remaining in the final solution?

A 250.mL sample of 0.0328M HCl is partially neutralized by the addition of 100.mL of 0.0245M NaOH.Find the concentration of hydrochloric acid in the resulting solution.

What volume (mL) of a 0.2450 M KOH(aq) solution is required to completely neutralize 55.25 mL of a 0.5440 M H3PO4(aq) solution?

Define the terms solution, solute, and solvent.

When solid iron(II) hydroxide is added to water, the resulting solution contains 1.4×10-3g of dissolved iron(II) hydroxide per liter of solution.What is the hydroxide ion concentration in this solution?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: H2CO3

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH3COOH.

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide.What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750.mL of water?

A 350.mL sample of 0.276M HNO3 is partially neutralized by 125 mL of 0.0120M Ca(OH) 2.Find the concentration of nitric acid in the resulting solution.

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH3OH (methanol).

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH3.

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: Al(NO3)3

What volume (mL) of a 0.3428 M HCl(aq) solution is required to completely neutralize 23.55 mL of a 0.2350 M Ba(OH) 2(aq) solution?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH4NO3

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s) + 2HCl(aq) $\rarr$ ZnCl₂(aq) + H₂(g) What mass of hydrogen gas is produced when a 7.35 g chunk of zinc dissolves in 500.mL of 1.200M HCl?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: H₃PO₄

Zinc dissolves in hydrochloric acid to yield hydrogen gas: Zn(s) + 2HCl(aq) $\rarr$ ZnCl₂(aq) + H₂(g) When a 12.7 g chunk of zinc dissolves in 500.mL of 1.450M HCl, what is the concentration of hydrogen ions remaining in the final solution?

What volume (mL) of a 0.2450 M KOH(aq) solution is required to completely neutralize 55.25 mL of a 0.5440 M H₃PO₄(aq) solution?

When solid iron(II) hydroxide is added to water, the resulting solution contains 1.4×10^-3g of dissolved iron(II) hydroxide per liter of solution.What is the hydroxide ion concentration in this solution?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: H₂CO₃

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH₃COOH.

A 350.mL sample of 0.276M HNO₃ is partially neutralized by 125 mL of 0.0120M Ca(OH) ₂.Find the concentration of nitric acid in the resulting solution.

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH₃OH (methanol).

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH₃.

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: Al(NO₃)₃

What volume (mL) of a 0.3428 M HCl(aq) solution is required to completely neutralize 23.55 mL of a 0.2350 M Ba(OH) ₂(aq) solution?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH₄NO₃