Molarity

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 to find moles from Molarity and volume?

Back

Moles = Molarity (M) × Volume (L).

Front

If you have a 9.65 M solution, how many moles are in 15.6 mL?

Back

Moles = 9.65 M × 0.0156 L = 0.150 mol.

Front

What is the molarity of a solution made by diluting a concentrated solution?

Back

M1V1 = M2V2, where M1 and V1 are the molarity and volume of the concentrated solution, and M2 and V2 are the molarity and volume of the diluted solution.

Front

How many grams of NaOH are needed to prepare 1 L of a 1 M solution?

Back

40 g of NaOH is needed (molar mass of NaOH = 40 g/mol).

Front

What is the molarity of a solution containing 186.55 g of sucrose in 250 mL of water?

Back

Molarity = (186.55 g / 342.3 g/mol) / 0.250 L = 2.18 M.

Front

How do you convert mL to L for molarity calculations?

Back

To convert mL to L, divide the volume in mL by 1000.

Front

What is the relationship between volume and molarity in dilution?

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 molarity of a solution if 1.07 moles of NaCl are dissolved in 125 mL of solution?

Back

Molarity = 1.07 moles / 0.125 L = 8.56 M.