Molarity and Dilution Mastery Quiz

Calculate the molarity of a solution containing 0.5 moles of NaCl dissolved in 2 liters of water.

• 0.25 M

• 0.5 M

• 1 M

• 2 M

If you dilute 100 mL of a 2 M HCl solution to a final volume of 500 mL, what is the new concentration?

• 0.2 M

• 0.4 M

• 0.5 M

• 1 M

How many grams of KCl (molar mass = 74.55 g/mol) are needed to prepare 250 mL of a 2 M solution?

• 18.64 g

• 37.28 g

• 74.55 g

• 149.1 g

Which of the following best describes a solute in a solution?

• The substance that dissolves the solvent

• The substance that is dissolved in the solvent

• The liquid part of the solution

• The gaseous part of the solution

A solution is prepared by diluting 50 mL of 6 M HNO₃ to a final volume of 300 mL. What is the molarity of the diluted solution?

• 0.5 M

• 1 M

• 2 M

• 3 M

If 0.1 moles of solute are dissolved in 500 mL of solution, what is the molarity?

• 0.1 M

• 0.2 M

• 0.5 M

• 1 M

Which of the following statements is true about dilutions?

• Diluting a solution increases its molarity.

• Diluting a solution decreases its molarity.

• Diluting a solution does not change its molarity.

• Diluting a solution increases the amount of solute.

How many moles of solute are present in 250 mL of a 3 M solution?

• 0.25 moles

• 0.5 moles

• 0.75 moles

• 1 mole

What is the final volume when 100 mL of a 4 M solution is diluted to 1 M?

• 200 mL

• 300 mL

• 400 mL

• 500 mL

Which of the following is the correct definition of molarity?

• Moles of solute per liter of solvent

• Moles of solute per liter of solution

• Grams of solute per liter of solvent

• Grams of solute per liter of solution