Q: What is the correct formula for calculating molarity ($M$) of a solution?

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

Q: Which of the following is the correct conversion factor to use when calculating the number of moles of NaCl in 3.00 L of a 0.500 M NaCl solution?

$0.500 \text{ mol NaCl} / 1 \text{ L solution}$

Question 1

Which of the following statements best describes a solution?

Accepted Answer

A solution is a homogenous mixture of two or more substances.

Question 2

In a glass of sweetened water, which component is the solvent?

Accepted Answer

Water

Question 3

Which of the following best describes a concentrated solution?

Accepted Answer

A solution with a large amount of solute compared to solvent.

Question 4

What is the correct formula for calculating molarity ($M$) of a solution?

Accepted Answer

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

Question 5

A student prepares 1.00 L of a 1.00 M NaCl solution. How many moles of NaCl are present in the solution?

Accepted Answer

1.00 mol

Question 6

If you have a 0.500 M NaCl solution, how many moles of NaCl are present in 2.00 L of solution?

Accepted Answer

1.00 mol

Question 7

A solution is prepared by dissolving 25.5 g KBr in enough water to make 1.75 L of solution. What is the molarity of the solution? (Molar mass of KBr = 119.00 g/mol)

Accepted Answer

$0.122 	ext{ M}$

Question 8

Which of the following is true about the composition of solutions?

Accepted Answer

The composition of a solution can vary from one sample to another.

Question 9

Which of the following is the correct conversion factor to use when calculating the number of moles of NaCl in 3.00 L of a 0.500 M NaCl solution?

Accepted Answer

$0.500 	ext{ mol NaCl} / 1 	ext{ L solution}$

Question 10

A chemist wants to prepare 2.00 L of a 0.250 M KCl solution. How many grams of KCl (molar mass = 74.55 g/mol) are needed?

Accepted Answer

37.28 g

Question 11

Which of the following statements is true regarding the process of preparing a solution of specified concentration?

Accepted Answer

The solute is weighed, added to a volumetric flask, dissolved, and then water is added up to the desired volume.

Question 12

Which of the following best describes a dilute solution?

Accepted Answer

A solution with a small amount of solute compared to solvent.

Question 13

A laboratory technician needs to make 500 mL of a 0.200 M NaCl solution. How many moles of NaCl are required?

Accepted Answer

0.100 mol

Question 14

Which of the following is NOT a correct statement about molarity?

Accepted Answer

Molarity is the amount of solute (in grams) divided by the volume of solution (in liters).

Question 15

A student has 0.250 L of a 2.00 M NaOH solution. How many moles of NaOH are present?

Accepted Answer

0.500 mol

Question 16

Which of the following is a real-world example of a solution where the solvent is not water?

Accepted Answer

Air, where nitrogen is the solvent and oxygen is the solute.

Chapter 5: Introduction to Solutions and Aqueous Reactions – Study Notes

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