Concentration of solution

Question 1

unit for concentration of solution

Answer 1

g dm-3

Question 2

solution

Answer 2

mixture of a solute in a solvent

Question 3

solute

Answer 3

substance that dissolves

Question 4

solvent

Answer 4

substance the solute dissolves into

Question 5

solvent in an aqueous solution

Answer 5

water

Question 6

state symbols for an aqueous solution and a liquid

Answer 6

(aq)

l

Question 7

concentration of a solution in g dm-3 (g/dm3)

(values needed and equation)

g/dm3 = grams per cubic decimetre

Answer 7

• mass of solute in grams
• volume of solution (or solvent) in cubic decimetres, dm3

concentration (g dm-3) = mass of solute (g) / volume of solution (dm3)

Question 8

how to convert between dm3 and cm3

Answer 8

1 dm3 = 10x10x10 = 1000 cm3

cm3 to dm3: /1000

Question 9

2.50g of sodium hydroxide is dissolved in 250cm3 of water

Calculate the concentration of the solution formed in g dm-3

Answer 9

250 cm3 = 250/1000 = 0.25 dm3

concentration = 2.50g/0.25dm3 = 10 g/dm3

Question 10

Calculate the concentrations of the following solutions formed:

a) 0.40g of glucose dissolved in 0.5dm3 of water
b) 1.25g of copper chloride dissolved in 100cm3 of water

Answer 10

a) 0.40g/0.5dm3 = 0.80 g dm-3
b) 100cm3/1000 = 0.1dm3
1. 25g/0.1dm3 = 12.5 g/dm3

Question 11

Calculate the mass of sodium hydroxide needed to make 150cm3 of a 40g/dm3 solution

Answer 11

150cm3/1000 = 0.15dm3

40g/dm3 = mass/0.15dm3
mass = 40 x 0.15

40g/dm3 x 0.15dm3 = 6.0g