Chemistry · Oct / Nov 2023 · Paper 62 · Question 4
0620
As printed in the paper
The question as text
The solubility of solid sodium sulfate in water changes as the temperature of the water changes. Plan an experiment to find out how the solubility of sodium sulfate in water changes with temperature. You are provided with sodium sulfate, distilled water and common laboratory apparatus. [6]
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
any 6 from:
add excess solute, find mass not dissolved
MP1 known / stated volume of water
MP2 add known / stated mass of sodium sulfate (in excess)
MP3 water and solute combined in a suitable named container (test-tube / boiling tube / beaker / flask / polystyrene cup) MP4 stir / mix / shake
MP5 filter
MP6 dry and weigh residue (ignore washing)
MP7 repeat at (an)other temperature(s)
OR
add solute gradually, stop when no more dissolves
MP1 known / stated volume of water
MP2 add stated measure of sodium sulfate
MP3 water and solute combined in a suitable named container (test-tube / boiling tube / beaker / flask / polystyrene cup) MP4 stir / mix / shake
MP5 if all dissolved, add more sodium sulfate
MP6 count number of measures / mass added / mass left from initial supply
MP7 repeat at (an)other temperature(s)
OR
add excess solute, find mass that dissolves
MP1 known / stated volume of water
MP2 add excess of sodium sulfate
MP3 water and solute combined in a suitable named container (test-tube / boiling tube / beaker / flask / polystyrene cup) MP4 stir / mix / shake
MP5 filter
MP6 heat solution to evaporate all water and weigh residue
MP7 repeat at (an)other temperature(s)
OR
fixed mass solute add solvent until all dissolves
MP1 add known volumes / fixed quantities of water gradually to
MP2 known / stated mass of sodium sulfate
MP3 water and solute combined in a suitable named container (test-tube / boiling tube / beaker / flask / polystyrene cup) MP4 stir / mix / shake
MP5 if not all dissolved, add more water
MP6 measure total volume of water added
MP7 repeat at (an)other temperature(s)
max 6
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.