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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