Review Molarity, Molality, & 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

What is molality?

Back

Molality (m) is a measure of concentration defined as the number of moles of solute per kilogram of solvent.

Front

How do you convert grams of solvent to kilograms?

Back

To convert grams to kilograms, divide the mass in grams by 1,000.

Front

How do you convert grams of solute to moles?

Back

To convert grams of solute to moles, divide the mass in grams by the molar mass of the solute.

Front

What is the formula for calculating molarity?

Back

Molarity (M) = moles of solute / liters of solution.

Front

What is the formula for calculating molality?

Back

Molality (m) = moles of solute / kilograms of solvent.

Front

If you have 0.4 mol of Na3PO4 in 1.04 L of water, what is the molarity?

Back

0.385 M.

Front

If you have 30.0 g of CaCl2 in 150 g of water, what is the molality?

Back

1.8 m.

Front

How many moles are in 0.919 L of a 2.70 M solution?

Back

2.48 mol.

Front

What is the relationship between molarity and volume?

Back

Molarity is directly proportional to the number of moles of solute and inversely proportional to the volume of solution.