Chemistry · May / June 2021 · Paper 62 · Question 1
0620
As printed in the paper
The question as text
Barium sulfate is an insoluble salt. Barium sulfate can be made by reacting excess aqueous sodium sulfate with aqueous barium chloride. sodium sulfate + barium chloride → sodium chloride + barium sulfate A student made a sample of barium sulfate using the following steps. excess aqueous sodium sulfate was added to aqueous barium chloride the mixture was stirred the solid barium sulfate was removed from the mixture step 1 step 2 step 3 B residue of solid barium sulfate A stir aqueous sodium sulfate aqueous barium chloride
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Show the answer and mark scheme
1(a)[2]
A glass / stirring rod
B (conical) flask
1(b)[1]
filtration
1(c)[1]
filtrate
1(d)[4]
step 4: wash / rinse (with water)
to remove sodium sulfate / sodium chloride
step 5: dry
water
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