Question 1

Which of the following best describes the process of dilution in chemistry?

Accepted Answer

The addition of more solvent to a solution to create a lower concentration.

Question 2

Given the dilution formula $$M_1$$ $$V_1$$ = $$M_2$$ $$V_2$$, what does $$M_2$$ represent?

Accepted Answer

$$M_2 is $$the molarity of the diluted solution after dilution.

Question 3

A scientist has 100 mL of a 2.0 M NaCl solution. How much water must be added to dilute it to 0.5 M?

Accepted Answer

300 mL

Question 4

If you have a stock solution of 5.0 M HCl and you want to prepare 250 mL of 1.0 M HCl, what volume of stock solution should you use?

Accepted Answer

50 mL

Question 5

Which of the following arrangements shows the solutions from least concentrated to most concentrated, if each sphere represents a mole of solute?

Accepted Answer

3/0.6 L, 2/0.4 L, 1/0.1 L

Question 6

A student needs to prepare 1.5 L of a 2.0 M solution from a 6.0 M stock solution. What volume of stock solution is required?

Accepted Answer

0.5 L

Question 7

Which equation would you use to solve for the volume of stock solution needed to make a diluted solution?

Accepted Answer

$$M_1$$ $$V_1$$ = $$M_2$$ $$V_2$$

Question 8

If you dilute 50 mL of a 4.0 M solution to a final volume of 200 mL, what is the final concentration?

Accepted Answer

1.0 M

Question 9

Why is it important to use the dilution formula in laboratory settings?

Accepted Answer

To accurately prepare solutions of desired concentrations for experiments.

Question 10

A nurse needs to prepare 500 mL of a 0.9% saline solution from a 3.6% stock solution. What volume of stock solution should be used?

Accepted Answer

125 mL

Question 11

If you have 250 mL of a 0.8 M solution and you want to dilute it to 0.2 M, what will be the final volume?

Accepted Answer

1000 mL

Question 12

Which of the following is a common misconception about dilution?

Accepted Answer

Dilution increases the concentration of a solution.

Question 13

A chemist wants to prepare 100 mL of a 0.1 M solution from a 1.0 M stock solution. How much stock solution is needed?

Accepted Answer

10 mL

Question 14

Which step is NOT necessary when performing a dilution in the laboratory?

Accepted Answer

Heating the solution to increase concentration.

Question 15

A biologist needs 250 mL of a 0.5 M buffer from a 2.0 M stock. What volume of stock solution is required?

Accepted Answer

62.5 mL

Dilutions in Chemistry: Concepts and Calculations

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