$$\text{moles} = \frac{\text{grams}}{\text{molar mass}}$$

Question 1

Which of the following best describes an aqueous solution?

Accepted Answer

A mixture in which water acts as the solvent.

Question 2

What is the molarity of a solution prepared by dissolving 25.5 g of KBr in enough water to make 1.75 L of solution? (Molar mass of KBr = 119.0 g/mol)

Accepted Answer

$$0.122	ext{ M}$$

Question 3

Which formula is used to calculate the dilution of a solution?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 4

A student needs to prepare 3.00 L of a 1.50 M NaOH solution from a 10.0 M stock solution. What volume of stock solution is required?

Accepted Answer

$$0.500	ext{ L}$$

Question 5

Which of the following statements about concentration is correct?

Accepted Answer

Concentration is the amount of solute dissolved in a given volume of solution.

Question 6

If you dilute 0.200 L of a 15.0 M NaOH solution to obtain a 3.00 M solution, what will be the final volume?

Accepted Answer

$$1.00	ext{ L}$$

Question 7

Which of the following is the correct conceptual plan for calculating molarity?

Accepted Answer

grams $$\rightarrow$$ moles $$\rightarrow$$ molarity

Question 8

A solution is made by dissolving 10.0 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 0.500 L of solution. What is the molarity?

Accepted Answer

$$0.342	ext{ M}$$

Question 9

Which of the following best describes a stock solution?

Accepted Answer

A solution with a high concentration used to prepare more dilute solutions.

Question 10

In a stoichiometric calculation involving solutions, which step must be performed first if you are given grams of a solute?

Accepted Answer

Convert grams to moles using the molar mass.

Question 11

Which of the following is NOT a correct unit for molarity?

Accepted Answer

$$	ext{g/L}$$

Question 12

If you have 0.125 M NaOH solution, how many moles of NaOH are present in 2.00 L of solution?

Accepted Answer

$$0.250	ext{ mol}$$

Question 13

Which of the following is the correct relationship for solution dilution?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 14

A solution contains 0.250 mol of solute in 0.500 L of solution. What is the molarity?

Accepted Answer

$$0.500	ext{ M}$$

Question 15

Which of the following is a correct statement about the effect of concentration on reaction rate in aqueous solutions?

Accepted Answer

Increasing the concentration of reactants generally increases the reaction rate.

Question 16

A student wants to prepare 250 mL of a 0.100 M solution from a 1.00 M stock solution. What volume of stock solution should be used?

Accepted Answer

$$25.0	ext{ mL}$$

Question 17

Which of the following is the correct formula for calculating moles from grams?

Accepted Answer

$$	ext{moles} = \frac{	ext{grams}}{	ext{molar mass}}$$

Question 18

Which of the following is a real-world application of solution dilution?

Accepted Answer

Preparing intravenous (IV) solutions in hospitals.

Question 19

If you have 0.300 L of a 2.00 M solution, how many moles of solute are present?

Accepted Answer

$$0.600	ext{ mol}$$

Question 20

Which of the following is the correct definition of a solute?

Accepted Answer

The minority component of a solution.

Introduction to Solutions and Aqueous Reactions: Concentration, Dilution, and Solution Stoichiometry

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