Concentration of solutions: 4.3.2 Use of amount of substance in relation to masses of pure substances: Chemistry AQA Q&A: GCSE (9:1)

g/dm³ or mol/dm³

What are the units of concentration?

1000

How many cm³ are there in 1 dm³?

0.3

How many dm³ is equal to 300 cm³?

10

What is the concentration of a solution, in g/dm³, where 20 grams of the substance is dissolved in 2 dm³?

1.8

What is the concentration of a solution, in g/dm³, where 0.9 grams of the substance is dissolved in 0.5 dm³?

75

What is the concentration of a solution, in g/dm³, where 15 grams of the substance is dissolved in 200 cm³?

34

What is the concentration of a solution, in g/dm³, where 8.5 grams of the substance is dissolved in 250 cm³?

72 g

What mass of substance would need to be dissolved in 3 dm³ of water to make a solution of concentration 24 g/dm³?

30 g

What mass of substance would need to be dissolved in 2.5 dm³ of water to make a solution of concentration 12 g/dm³?

6 g

What mass of substance would need to be dissolved in 50 cm³ of water to make a solution of concentration 120 g/dm³?

13.5 g

What mass of substance would need to be dissolved in 150 cm³ of water to make a solution of concentration 90 g/dm³?

80 cm³

20 cm³ of a solution has a concentration of 25 g/dm³. What volume of water should be added to the solution to dilute it to a new concentration of 5 g/dm³?