Molarity & 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 is molarity calculated?

Back

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

Front

What is the molar mass of Na2O?

Back

62 g/mol.

Front

What remains constant during dilution?

Back

The total moles of solute remain constant during dilution.

Front

What is the formula for dilution?

Back

M1V1 = M2V2, where M1 and V1 are the molarity and volume of the concentrated solution, and M2 and V2 are the molarity and volume of the diluted solution.

Front

What are the units of molarity?

Back

The units of molarity are moles per liter (mol/L).

Front

How do you find the molarity of a solution made by adding 1.565 moles of PbNO3 to 500 mL?

Back

Molarity = 1.565 moles / 0.5 L = 3.13 M.

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

Molarity = (6.00 M)(26.5 mL) / 250 mL = 0.636 M.

Front

What does the term 'dilution' mean in chemistry?

Back

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

Front

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

Back

Moles = Molarity x Volume.