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 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 initial solution, and C2 and V2 are the concentration and volume of the diluted solution.

Front

What happens to the concentration when you dilute a solution?

Back

The concentration decreases when you add more solvent to a solution.

Front

If you have 340 mL of a 0.5 M NaBr solution and add 560 mL of water, what is the new concentration?

Back

0.188 M.

Front

How do you find the number of moles from grams?

Back

Moles = mass (g) / molar mass (g/mol).

Front

Calculate the Molarity of a solution containing 40.0 g of NaCl in 0.50 L of water.

Back

1.37 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 volume of a 0.500 M solution containing 0.750 moles of NaOH?

Back

1500 mL.

Front

How do you prepare a 1 M solution from a 2 M solution?

Back

Dilute the 2 M solution by adding an appropriate volume of solvent.