Question 1

Which of the following best describes the role of an acid in terms of proton transfer?

Accepted Answer

An acid is a proton donor.

Question 2

Which salt is insoluble in water according to the solubility rules?

Accepted Answer

Lead(II) sulfate

Question 3

What is the balanced chemical equation for the reaction between copper(II) oxide and dilute sulfuric acid to prepare copper(II) sulfate crystals?

Accepted Answer

$\mathrm{CuO\ (s) + H_2SO_4\ (aq) \rightarrow CuSO_4\ (aq) + H_2O\ (l)}$

Question 4

Why is the insoluble base added in excess during the preparation of a soluble salt from an acid and an insoluble base?

Accepted Answer

To ensure all the acid reacts and no acid remains in solution.

Question 5

Which of the following is a correct general equation for the reaction of an acid with a metal carbonate?

Accepted Answer

$\mathrm{acid + metal\ carbonate \rightarrow salt + carbon\ dioxide + water}$

Question 6

A student wants to prepare a pure, dry sample of lead(II) sulfate. Which method should they use?

Accepted Answer

Mixing solutions of lead(II) nitrate and potassium sulfate, then filtering and drying the precipitate.

Question 7

Which of the following observations would indicate that a reaction between an acid and a base involves a carbonate?

Accepted Answer

Effervescence (bubbling) is observed.

Question 8

What is the ionic equation for the neutralization reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$\mathrm{H^+\ (aq) + OH^-\ (aq) \rightarrow H_2O\ (l)}$

Question 9

Which of the following steps is NOT necessary when preparing a soluble salt using titration?

Accepted Answer

Evaporating all the water until the salt is completely dry.

Question 10

Which of the following best explains why all nitrates are soluble in water?

Accepted Answer

Nitrate ions do not form precipitates with any common cations.

Question 11

A student mixes solutions of silver nitrate and sodium chloride. What is the precipitate formed?

Accepted Answer

Silver chloride

Question 12

Which of the following is the correct sequence of steps for preparing an insoluble salt by precipitation?

Accepted Answer

Mix solutions, filter, wash precipitate, dry in oven

Question 13

Which of the following is a base but NOT an alkali?

Accepted Answer

Copper(II) oxide

Question 14

What is the main reason for washing the precipitate with distilled water during the preparation of an insoluble salt?

Accepted Answer

To remove traces of soluble reactants.

Question 15

Which of the following equations represents the reaction between zinc carbonate and sulfuric acid?

Accepted Answer

$\mathrm{ZnCO_3\ (s) + H_2SO_4\ (aq) \rightarrow ZnSO_4\ (aq) + CO_2\ (g) + H_2O\ (l)}$

Question 16

Which laboratory apparatus is essential for separating an insoluble salt from a reaction mixture?

Accepted Answer

Filter funnel and filter paper

Question 17

A solution turns red litmus paper blue. Which ion is most likely present in high concentration?

Accepted Answer

$\mathrm{OH^-}$

Question 18

Which of the following best describes the difference between a base and an alkali?

Accepted Answer

All alkalis are bases, but not all bases are alkalis.

Question 19

Which of the following is a correct method for preparing a pure, dry sample of copper(II) sulfate crystals?

Accepted Answer

React copper(II) oxide with dilute sulfuric acid, filter, evaporate, and crystallize.

Acids, Bases, and Salt Preparations: Study Notes for General Chemistry

Study Guide - Practice Questions