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 molarity of a solution containing 1.8 moles of NaOH in 250 mL of water?

Back

7.2 M

Front

What happens to the concentration of a solution when it is diluted?

Back

The concentration decreases as more solvent is added.

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 dilute 0.775 L of 1.00 M NaOH to 1.00 L, how many moles of NaOH are present?

Back

0.775 mol NaOH.

Front

What is a dilution?

Back

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

Front

What is the concentration of a solution?

Back

Concentration is a measure of how much solute is present in a given volume of solution.

Front

How do you prepare a 0.20 M solution from a 1.0 M solution?

Back

Add 160 mL of water to the 40 mL of 1.0 M solution.

Front

What is the effect of adding water to a concentrated solution?

Back

It decreases the concentration of the solution.