Calculating 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 moles from molarity and volume?

Back

Moles = Molarity (M) × Volume (L). Convert mL to L by dividing by 1000.

Front

What is the molar mass of NaCl?

Back

The molar mass of NaCl (sodium chloride) is approximately 58.44 g/mol.

Front

If you have a 1 M solution of NaCl, how many grams are in 1 liter?

Back

1 M NaCl means there are 58.44 grams of NaCl in 1 liter of solution.

Front

What is the relationship between molarity and the amount of solute?

Back

Higher molarity means more solute is dissolved in a given volume of solution.

Front

How do you convert grams of solute to moles?

Back

Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the formula to find the molarity of a solution?

Back

Molarity (M) = Moles of solute / Volume of solution (L).

Front

How many moles are in 250 mL of a 2 M solution?

Back

Moles = 2 M × 0.250 L = 0.5 moles.

Front

What is the effect of temperature on molarity?

Back

Molarity can change with temperature due to changes in volume of the solution.

Front

How do you find the molarity of a solution if you know the mass of solute and volume of solution?

Back

First, convert mass to moles, then use Molarity = Moles / Volume (L).