Molarity and Dilutions

The term molar, which describes a solution's concentration, is written as?

• M

• mol

• g

• g/L

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

Calculate the Molarity in a solution containing 40.0 g of NaCl dissolved in 500.0 ml of H2O.

• 0.08 M

• 12.5 M

• 1.37 M

• 0.74 M

Calculate the grams of NaOH present in 10.0 mL of a 2.0 M NaOH solution.

• 0.8 grams

• 2000 grams

• 0.3 grams

• 5 grams

Molarity is ...

• grams of solute/deciliters of solvent.

• grams of solute/liters of solution.

• moles of solute/liters of solution.

• moles of solute/milliliters of solvent.

A solution is made by dissolving 0.50 mole of NaCl in enough water to give a final volume of 400.0 mL. What is the molarity of the solution?

• 0.10 M

• 0.40 M

• 1.25 M

• 2.33 M

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

As we dilute a solution.....

• The volume increases and the molarity (M) increases

• The volume increases and the molarity (M) decreases

• The volume decreases and the molarity (M) increases

• The volume decreases and the molarity (M) decreases