Unit 9 Exam Test Corrections

Front

What is molarity?

Back

Molarity 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

If you have 240 mL of a 5 M NaBr solution and add 160 mL of water, what is the new concentration?

Back

3.0 M

Front

What is the molarity of a solution containing 2.50 mol of solute in 5.00 L of solution?

Back

0.50 M

Front

What is the molarity of 5.60 mol of sodium carbonate in 1.500 L of solution?

Back

3.7 M

Front

Which unit is used to measure solution concentration in chemistry?

Back

Molarity

Front

What does a higher molarity indicate about a solution?

Back

A higher molarity indicates a greater concentration of solute in the solution.

Front

What is the relationship between volume and molarity when diluting a solution?

Back

When diluting a solution, the number of moles of solute remains constant, but the volume increases, resulting in a lower molarity.

Front

What is the formula to find the number of moles from molarity and volume?

Back

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

Front

What happens to the molarity of a solution if you add more solute?

Back

The molarity of the solution increases.