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 formula for dilution?

Back

C1V1 = C2V2, where C1 and V1 are the concentration and volume of the initial solution, and C2 and V2 are the concentration and volume of the diluted solution.

Front

What is the molar mass of sucrose (C12H22O11)?

Back

The molar mass of sucrose is 342.30 g/mol.

Front

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

Back

Use the dilution formula: C1V1 = C2V2. For 200 mL of 0.20 M from 1.0 M, V1 = (0.20 M * 200 mL) / 1.0 M = 40 mL.

Front

What is the molarity of a solution made by dissolving 0.50 moles of NaCl in 400 mL of water?

Back

Molarity = 0.50 moles / 0.4 L = 1.25 M.

Front

How many grams of solute are needed for a specific molarity?

Back

Grams of solute = molarity (M) * volume (L) * molar mass (g/mol).

Front

What is the molar mass of AgNO3?

Back

The molar mass of AgNO3 is 169.87 g/mol.

Front

If you have 10.0 M NaOH, how do you dilute it to 2.00 M?

Back

Use the dilution formula: C1V1 = C2V2. For 300 mL of 2.00 M, V1 = (2.00 M * 300 mL) / 10.0 M = 60 mL.

Front

What is the final volume when diluting a solution?

Back

Final volume = initial volume + volume of solvent added.