Concentration

Question 1

what is concentration?

Answer 1

• the more crowded the molecules are the more concentrated the solution

Question 2

what is concentration mesured in

Answer 2

g/dm³

Question 3

25g of copper sulphate is dissolved in 500cm_³ of water.

what is the concentration in g/dm³

Answer 3

1. Convert volume to dm² (500) /100 = 0.5dm³
2. Mass / Volume; 25 /0.5 = 50g/dm³

Question 4

what is the equation for concentration

Answer 4

concentration =mass of solute/ volume of solution

Question 5

Describe the practical for finding known concentration

Make 250 cm² of a 314 g/dm³ solution of sodium Chloride

Answer 5

1. Find out how many grams of the solute needed using mass = concentration x volume
2. 314 g/dm³ x 0.25dm³=78.5g
3. Weigh out mass
4. Add deionized water to the beaker and stir till the solute has disolved
   5.