Q: Which of the following is the correct formula for calculating molarity ($M$)?

$M = \frac{\text{moles of solute}}{\text{volume of solution (L)}}$

Question 1

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

Sodium chloride ($\mathrm{NaCl}$)

Question 2

Which statement best describes a precipitation reaction?

Accepted Answer

A reaction in which two aqueous solutions combine to form an insoluble solid.

Question 3

What is the net ionic equation for the reaction between $\mathrm{AgNO_3}$ (aq) and $\mathrm{NaCl}$ (aq)?

Accepted Answer

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

Question 4

A student needs to prepare 250 mL of 0.10 M $\mathrm{Na_2SO_4}$ solution from a 1.0 M stock solution. What volume of stock solution should be used?

Accepted Answer

$50$ mL

Question 5

Which of the following is a weak acid?

Accepted Answer

Acetic acid ($\mathrm{CH_3COOH}$)

Question 6

What is the molarity of a solution prepared by dissolving 5.00 g of $\mathrm{NaCl}$ in enough water to make 250 mL of solution? ($\mathrm{NaCl}$ molar mass = $58.44$ g/mol)

Accepted Answer

$0.20$ M

Question 7

Which of the following best describes a nonelectrolyte?

Accepted Answer

A substance that does not produce ions in solution and does not conduct electricity.

Question 8

Which of the following is the correct formula for calculating molarity ($M$)?

Accepted Answer

$M = \frac{	ext{moles of solute}}{	ext{volume of solution (L)}}$

Question 9

Which of the following reactions is a neutralization reaction?

Accepted Answer

$\mathrm{HCl (aq) + NaOH (aq) \rightarrow NaCl (aq) + H_2O (l)}$

Question 10

A solution is prepared by mixing 100 mL of 0.50 M $\mathrm{NaCl}$ with 400 mL of water. What is the final concentration of $\mathrm{NaCl}$?

Accepted Answer

$0.10$ M

Question 11

Which of the following best describes the process of exchanging ions in a precipitation reaction?

Accepted Answer

Ions from two soluble compounds switch partners to form a solid precipitate.

Question 12

Which of the following is a correct net ionic equation for the reaction between $\mathrm{BaCl_2}$ (aq) and $\mathrm{Na_2SO_4}$ (aq)?

Accepted Answer

$\mathrm{Ba^{2+} (aq) + SO_4^{2-} (aq) \rightarrow BaSO_4 (s)}$

Question 13

Which of the following is a property of strong acids?

Accepted Answer

They produce large concentrations of $\mathrm{H^+}$ ions in solution.

Question 14

A student mixes 50 mL of 0.20 M $\mathrm{HCl}$ with 50 mL of 0.20 M $\mathrm{NaOH}$. What is the concentration of $\mathrm{NaCl}$ formed in the final 100 mL solution?

Accepted Answer

$0.20$ M

Question 15

Which of the following is the correct formula for a dilution calculation?

Accepted Answer

$C_1V_1 = C_2V_2$

Question 16

Which of the following is a correct Bronsted-Lowry definition of an acid?

Accepted Answer

An acid is a substance that donates an $\mathrm{H^+}$ ion.

Question 17

Which of the following is a strong base?

Accepted Answer

Sodium hydroxide ($\mathrm{NaOH}$)

Question 18

A solution contains 0.50 mol of $\mathrm{KNO_3}$ dissolved in 1.0 L of water. What is the molarity of the solution?

Accepted Answer

$0.50$ M

Question 19

Which of the following best describes the difference between a solute and a solvent?

Accepted Answer

The solute is the substance that dissolves; the solvent is the substance that does the dissolving.

Ch. 4 Aqueous Solutions, Electrolytes, Acids & Bases, and Stoichiometry: General Chemistry Study Notes

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