Chemistry · Oct / Nov 2021 · Paper 61 · Question 1
0620
As printed in the paper
The question as text
A student investigated the volume of dilute sulfuric acid that would react with 25.0 cm3 of aqueous sodium carbonate. ● A burette was rinsed with water and then with dilute sulfuric acid. ● The burette was filled with dilute sulfuric acid. Some of the dilute sulfuric acid was run out of the burette so that the level of the dilute sulfuric acid was on the burette scale. ● 25.0 cm3 of aqueous sodium carbonate was poured into the apparatus labelled A in the diagram. ● Five drops of methyl orange indicator were added to the aqueous sodium carbonate in A. ● The apparatus labelled A was placed on a white tile. ● The dilute sulfuric acid was added slowly to the 25.0 cm3 of aqueous sodium carbonate until the colour of the methyl orange changed from yellow to orange. The apparatus was arranged as shown in the diagram. aqueous sodium carbonate A burette white tile dilute sulfuric acid
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Show the answer and mark scheme
1(a)[1]
(conical) flask
1(b)[1]
safety glasses/goggles/gloves/lab coat
1(c)[1]
to see colour change clearly/easily/accurately/better
1(d)[1]
swirl the flask
1(e)[2]
water: to clean / to remove residue from previous experiment
acid: to remove the water
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