Q: What is the molarity of a solution prepared by dissolving 0.50 mol of NaCl in enough water to make 2.0 L of solution?

$M = \frac{0.50}{2.0} = 0.25\ \text{M}$

Q: A student needs to prepare 500.0 mL of 0.200 M HNO$_3$ from a stock solution of 1.00 M HNO$_3$. What volume of the stock solution should be used?

$V_1 = \frac{M_2 V_2}{M_1} = \frac{0.200 \times 0.500}{1.00} = 0.100\ \text{L} = 100.0\ \text{mL}$

Q: Which of the following is the correct net ionic equation for the reaction between AgNO$_3$(aq) and NaCl(aq)?

$\text{Ag}^+(aq) + \text{Cl}^-(aq) \rightarrow \text{AgCl}(s)$

Q: Which of the following reactions is a redox reaction?

$2\text{Na}(s) + \text{Cl}_2(g) \rightarrow 2\text{NaCl}(s)$

Q: A 0.762-g sample of vinegar is titrated with 0.2250 M NaOH. The buret reading goes from 0.31 mL to 48.00 mL. What is the percent by mass of acetic acid in the sample? (Molar mass of acetic acid = 60.05 g/mol)

$\text{Percent} = \frac{(0.2250 \times 47.69 \times 10^{-3}) \times 60.05}{0.762} \times 100 \approx 21.2\%$

Q: Which of the following is the correct molecular equation for the reaction between H$_2$SO$_4$(aq) and Ba(OH)$_2$(aq)?

$\text{H}_2\text{SO}_4(aq) + \text{Ba(OH)}_2(aq) \rightarrow 2\text{H}_2\text{O}(l) + \text{BaSO}_4(s)$

Q: What is the concentration of Cl$^-$ ions in a solution made by mixing 50.0 mL of 0.20 M NaCl and 50.0 mL of 0.40 M Na$_2$SO$_4$?

$[\text{Cl}^-] = \frac{0.20 \times 0.050}{0.100} = 0.10\ \text{M}$

Q: Which of the following reactions is a gas-evolution reaction?

$\text{K}_2\text{CO}_3(aq) + 2\text{HCl}(aq) \rightarrow 2\text{KCl}(aq) + \text{H}_2\text{O}(l) + \text{CO}_2(g)$

Q: Which of the following is the correct formula for calculating molarity?

$M = \frac{\text{amount of solute (in mol)}}{\text{volume of solution (in L)}}$

Question 1

Which of the following statements best describes a solution?

Accepted Answer

A solution is a homogeneous mixture in which the majority component is the solvent and the minority component is the solute.

Question 2

What is the molarity of a solution prepared by dissolving 0.50 mol of NaCl in enough water to make 2.0 L of solution?

Accepted Answer

$M = \frac{0.50}{2.0} = 0.25\ 	ext{M}$

Question 3

A student needs to prepare 500.0 mL of 0.200 M HNO$_3$ from a stock solution of 1.00 M HNO$_3$. What volume of the stock solution should be used?

Accepted Answer

$V_1 = \frac{M_2 V_2}{M_1} = \frac{0.200 	imes 0.500}{1.00} = 0.100\ 	ext{L} = 100.0\ 	ext{mL}$

Question 4

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

BaSO$_4$

Question 5

Which of the following is a strong electrolyte?

Accepted Answer

NaCl (sodium chloride)

Question 6

Which of the following is the correct net ionic equation for the reaction between AgNO$_3$(aq) and NaCl(aq)?

Accepted Answer

$	ext{Ag}^+(aq) + 	ext{Cl}^-(aq) ightarrow 	ext{AgCl}(s)$

Question 7

Which of the following acids is classified as a strong acid?

Accepted Answer

HNO$_3$ (nitric acid)

Question 8

What is the oxidation state of nitrogen in NO$_3^-$?

Accepted Answer

$+5$

Question 9

Which of the following reactions is a redox reaction?

Accepted Answer

$2	ext{Na}(s) + 	ext{Cl}_2(g) ightarrow 2	ext{NaCl}(s)$

Question 10

A 0.762-g sample of vinegar is titrated with 0.2250 M NaOH. The buret reading goes from 0.31 mL to 48.00 mL. What is the percent by mass of acetic acid in the sample? (Molar mass of acetic acid = 60.05 g/mol)

Accepted Answer

$	ext{Percent} = \frac{(0.2250 	imes 47.69 	imes 10^{-3}) 	imes 60.05}{0.762} 	imes 100 \approx 21.2\%$

Question 11

Which of the following is the correct molecular equation for the reaction between H$_2$SO$_4$(aq) and Ba(OH)$_2$(aq)?

Accepted Answer

$	ext{H}_2	ext{SO}_4(aq) + 	ext{Ba(OH)}_2(aq) ightarrow 2	ext{H}_2	ext{O}(l) + 	ext{BaSO}_4(s)$

Question 12

Which of the following is a weak base?

Accepted Answer

NH$_3$

Question 13

What is the concentration of Cl$^-$ ions in a solution made by mixing 50.0 mL of 0.20 M NaCl and 50.0 mL of 0.40 M Na$_2$SO$_4$?

Accepted Answer

$[	ext{Cl}^-] = \frac{0.20 	imes 0.050}{0.100} = 0.10\ 	ext{M}$

Question 14

Which of the following is a spectator ion in the reaction between Na$_2$SO$_4$(aq) and BaCl$_2$(aq)?

Accepted Answer

Na$^+$

Question 15

Which of the following reactions is a gas-evolution reaction?

Accepted Answer

$	ext{K}_2	ext{CO}_3(aq) + 2	ext{HCl}(aq) ightarrow 2	ext{KCl}(aq) + 	ext{H}_2	ext{O}(l) + 	ext{CO}_2(g)$

Question 16

In the reaction $2	ext{Na}(s) + 	ext{Cl}_2(g) ightarrow 2	ext{NaCl}(s)$, which species is the oxidizing agent?

Accepted Answer

Cl$_2$

Question 17

Which of the following is the correct formula for calculating molarity?

Accepted Answer

$M = \frac{	ext{amount of solute (in mol)}}{	ext{volume of solution (in L)}}$

Question 18

Which of the following is true about strong bases?

Accepted Answer

They completely dissociate in water to produce OH$^-$ ions.

Module 6: Introduction to Solutions and Aqueous Reactions – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards