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Exam 4: Reactions in Aqueous Solution

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Question 61

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Which substance is acting as a Brønsted acid in the following reaction? HSO₄^- + NH₄⁺ $\rarr$ H₂SO₄ + NH₃

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NH4

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Question 62

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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

F) D) and E)
G) None of the above

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Question 63

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Identify the oxidizing agent in the following chemical reaction. 2MnO₄^- + 5H₂SO₃ $\rarr$ 2Mn²⁺ + 5SO₄^2- + 4H⁺ + 3H₂O

Based on the solubility rules, which one of the following should be soluble in water?

Which choice gives the correct oxidation numbers for all three elements in Rb₂SO₃ in the order that the elements are shown in the formula?

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH₄Cl.

In the following chemical reaction the oxidizing agent is: 5H₂O₂ + 2MnO₄^- + 6H⁺ $\rarr$ 2Mn²⁺ + 8H₂O + 5O₂

Calcium sulfate dihydrate (commonly known as gypsum) dissolves in cold water to the extent of 0.241 g per 100. cm³. What is the concentration of calcium ions in this solution?

A piece of zinc metal was added to an aqueous solution of lead(II)nitrate. After some time it was observed that the zinc metal had appeared to fall apart and a solid had accumulated at the bottom of the reaction vessel. Write the net ionic equation for this reaction.

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

Write a balanced molecular equation for the reaction that occurs when aqueous solutions of potassium iodide and lead(II)nitrate are combined.

A piece of lead metal was added to an aqueous solution of copper(II)nitrate, and within a few minutes it was observed that the lead turned black and crumbled, and the blue solution characteristic of copper(II)ions faded. (NOTE: Lead forms a 2+ ion when it reacts.) Write the balanced chemical equation for this reaction.

Identify the Brønsted acid in the following reaction. NH₃ + H₂O $\rarr$ NH₄⁺ + OH^-

What element is oxidized in the following chemical reaction? 3Cu + 8HNO₃ $\rarr$ 3Cu(NO₃) ₂ + 2NO + 4H₂O

During a titration the following data were collected. A 10. mL portion of an unknown monoprotic acid solution was titrated with 1.0 M NaOH; 40. mL of the base were required to neutralize the sample. How many moles of acid are present in 2.0 liters of this unknown solution?

What is the chemical formula of the salt produced by the neutralization of nitric acid with calcium hydroxide?

The oxidation number of N in NO is +7.

Identify the reducing agent in the following chemical reaction. 5Fe²⁺(aq) + MnO₄^-(aq) + 8H⁺(aq) $\rarr$ 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(l)

Hydrogen is oxidized in the following chemical reaction. H₂ + Cl₂ $\rarr$ 2HCl

A piece of lead metal was added to an aqueous solution of copper(II)nitrate, and within a few minutes it was observed that the lead turned black and crumbled, and the blue solution characteristic of copper(II)ions faded. (NOTE: Lead forms a 2+ ion when it reacts.) Write the net ionic equation for this reaction.