HONORS: Molarity of Solutions & 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 a solvent?

Back

A solvent is a substance that dissolves a solute, resulting in a solution. Example: Water.

Front

What happens to molarity when a solution is diluted?

Back

When a solution is diluted, the volume increases and the molarity decreases.

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 1.0 M KCl and dilute it to 2.0 L, what is the new molarity if you add 1.0 L of water?

Back

The new molarity will be 0.67 M.

Front

What is the molarity of a solution made by dissolving 2 moles of NaCl in 1 L of water?

Back

The molarity is 2 M.

Front

How many moles of solute are in 500 mL of a 0.5 M solution?

Back

There are 0.25 moles of solute.

Front

What is the effect of temperature on molarity?

Back

Molarity can change with temperature because the volume of the solution may expand or contract.

Front

If you dilute 100 mL of a 3 M solution to 300 mL, what is the new molarity?

Back

The new molarity is 1 M.