Molarity and Dilution Practice Calculations

Front

What is molarity?

Back

Molarity (M) is a measure of concentration 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 for dilution?

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

If you have a 2M solution and want to dilute it to 0.5M, what happens to the volume?

Back

The volume increases when diluting a solution.

Front

What is the molarity of a solution made by dissolving 1 mole of solute in 1 liter of solution?

Back

1 M (one molar).

Front

How many moles are in 0.5 L of a 2M solution?

Back

1 mole (calculated as 2M x 0.5L = 1 mole).

Front

What is the final concentration if you mix 100 mL of 1M NaCl with 100 mL of water?

Back

0.5 M (the total volume is 200 mL, so 1M x 100mL / 200mL = 0.5M).

Front

How do you prepare a 0.1M solution from a 1M stock solution?

Back

Dilute 10 mL of the 1M solution to a final volume of 100 mL with water.

Front

What is the molarity of a solution if 0.25 moles of solute are dissolved in 0.5 L of solution?

Back

0.5 M (0.25 moles / 0.5 L = 0.5 M).

Front

If you need 250 mL of a 0.2M solution, how many moles of solute do you need?

Back

0.05 moles (0.2M x 0.25L = 0.05 moles).