Molarity and Dilution Practice Calculations

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 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 a solution, what happens to its molarity?

Back

The molarity decreases as the volume of the solution increases.

Front

What is the molarity of a solution containing 58.44 g of NaCl (MM: 58.44 g/mol) in 1 L of solution?

Back

1 M (since 58.44 g of NaCl equals 1 mole).

Front

How do you find the number of moles from grams?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the molarity of a solution made by diluting 100 mL of 6 M HCl to a final volume of 500 mL?

Back

1.2 M.

Front

If you have 250 mL of a 2 M solution, how many moles of solute do you have?

Back

0.5 moles (2 M x 0.250 L = 0.5 moles).

Front

What is the effect of adding more solvent to a solution?

Back

It decreases the concentration (molarity) of the solution.

Front

How do you prepare a specific molarity solution from a stock solution?

Back

Use the dilution formula C1V1 = C2V2 to calculate the volume of stock solution needed.