Molarity & Dilutions

Front

What is molarity?

Back

Molarity is a measure of the concentration of a solute in a solution, expressed as moles of solute per liter of solution (mol/L).

Front

How do chemists describe the 'strength' or concentration of a solution?

Back

Molarity.

Front

What is the formula to calculate molarity?

Back

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

Front

If you have 0.5 moles of NaCl in 2 liters of solution, what is the molarity?

Back

0.25 M.

Front

What is the volume (in liters) of a 0.20 M solution that contains 0.30 moles of Na2SO4?

Back

1.5 L.

Front

What happens to the molarity of a solution when more solvent is added?

Back

The molarity decreases.

Front

What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO3 to a volume of 250 mL?

Back

0.636 M.

Front

If you have 34 mL of a 0.5 M NaBr solution, what will the concentration be if 56 mL of water is added?

Back

0.189 M.

Front

How do you calculate the number of moles from molarity and volume?

Back

Moles = Molarity (M) x Volume (L).

Front

What is a dilution?

Back

A dilution is the process of reducing the concentration of a solute in a solution, usually by adding more solvent.