5.8 Concentration of solutions

Question 1

Concentration

Answer 1

The concentration of a solution can be measured in moles per given volume of solution.

For example, if there is a beaker containing 50 dm³ of a substance, the unit of concentration would be mol/dm³.

Question 2

Calculating moles of solute

Answer 2

To calculate the moles of solute in a given volume of a known concentration use moles = concentration x volume

Moles / dm³ x dm³

Question 3

Volume

Answer 3

A smaller volume or a larger number of moles gives a higher concentration

A larger volume or a smaller number of moles of solute gives a lower concentration

g dm³ -> mol dm³ divide by molar mass in grams
mol dm³ -> g dm³ multiply by molar mass in grams