What are percentages of concentration?
1 Answer
There are three common percentages of concentration: mass percent, volume percent, and mass per volume percent.
Percent means "per hundred".
Mass Percent (m/m)
Mass percent is the number of grams of substance in 100 g of the mixture. The formula is
Mass % =
Volume Percent (m/v)
Volume percent is the number of millilitres of substance in 100 mL of the solution. The formula is
Volume % =
Mass by Volume Percent (m/v)
Mass by volume percent is the number of grams of substance in 100 mL of the solution. The formula is
m/v % =
Examples

Calculate the mass percent of NaCl in a solution that contains 300 g NaCl in 1200 g solution.

Calculate the volume percent of isopropyl alcohol in a solution that contains 700 mL of isopropyl alcohol in 1.00 L of solution.

Calculate the m/v % of K₂SO₄ in a solution that contains 75.0 g K₂SO₄ in 1.50 L of solution.
1. m/m % NaCl =
2. v/v % =
3. m/v % =