Molarity and Dilutions Review

You need to make 200 mL of a 0.20 M aqueous solution of sodium chloride. The only available solution is 1.0 M. Determine how to make the needed dilution.

• Add 160 mL to the initial volume

• Add 160 grams to the initial volume

• Evaporate 160 mL from the initial volume

• the experiment cannot be conducted with the materials provided

A dilution is when

• solute is added to the volume of stock solution

• water is added to the volume of stock solution

• solute is removed from the volume of stock solution

• water is removed from the volume of stock solution

What volume, in milliliters, of 10.0 M NaOH is needed to prepare 300 mL of 2.00 M NaOH by dilution?

• 0.067 mL

• 60.0 mL

• 100 mL

• 125 mL

If 0.775 L of 1.00 M NaOH is diluted to 1.00 L, the resulting solution contains

• 0.225 mol NaOH

• 0.775 mol NaOH

• 1.25 mol NaOH

• 2.45 mol NaOH

What is a concentrated solution?

• a solution that has a large amount of solute in a large volume of solvent

• a solution that has an equal amount of solute in the same volume of solvent

• a solution that has a small amount of solute in a large volume of solvent

• a solution that has a large amount of solute in a small volume of solvent

Which of the following solutions has a molarity of 2.0?

• 0.050 mole of solute in 0.0250 L of solution

• 2.0 moles of solute in 0.5000 L of solution

• 3.0 moles of solute in 1.5000 L of solution

• none of the above