Molarity and Dilutions

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 the volume of a solution from moles and molarity?

Back

Volume (L) = Moles of solute / Molarity.

Front

What is the formula for dilution?

Back

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

Front

If you have a 0.500 M NaOH solution containing 0.750 moles of solute, what is the volume of the solution?

Back

1500 mL.

Front

How do you prepare a diluted solution from a concentrated solution?

Back

Use the dilution formula C1V1 = C2V2 to find the volume of the concentrated solution needed.

Front

What is the molarity of a solution made by dissolving 0.50 mole of NaCl in 400.0 mL of water?

Back

1.25 M.

Front

How many mL of 10.8M HCl are needed to make 100.0 mL of 3.00M acid?

Back

27.8 mL.

Front

What is the relationship between moles, volume, and molarity?

Back

Molarity is the ratio of moles of solute to the volume of solution in liters.

Front

If 125.0 mL of 2.00 M calcium hydroxide is diluted to 1.50 M, how much water is added?

Back

42.0 mL.

Front

What does it mean to dilute a solution?

Back

Diluting a solution means adding more solvent to decrease the concentration of the solute.