Test Review on Molarity and Dilution

Front

What is molarity?

Back

Molarity (M) is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per liter of solution.

Front

How do you calculate molarity?

Back

Molarity (M) = moles of solute / liters of solution.

Front

What is the formula mass (FM) of a compound?

Back

The formula mass (FM) is the sum of the atomic masses of all atoms in a chemical formula, expressed in grams per mole (g/mol).

Front

How do you convert grams of a substance to moles?

Back

Moles = grams of substance / formula mass (g/mol).

Front

What is the molarity of a solution containing 400 g of CuSO4 (FM: 159.6 g/mol) in 4.0 L of solution?

Back

0.626 M

Front

How many moles of solute are present in 50.0 mL of 0.20 M KNO3?

Back

0.01 moles solute

Front

What is the dilution formula?

Back

C1V1 = C2V2, where C1 and V1 are the concentration and volume of the stock solution, and C2 and V2 are the concentration and volume of the diluted solution.

Front

What happens to the total moles of solute during dilution?

Back

The total moles of solute remain constant during dilution.

Front

How do you make a dilution?

Back

To make a dilution, add more solvent to the solution.

Front

What is the molarity of a solution if you take 10 mL of a 13 M stock solution and make a 300 mL solution?

Back

0.43 M