Chemistry · May / June 2024 · Paper 61 · Question 1
0620
As printed in the paper
The question as text
A student carries out a titration to find the concentration of a sample of dilute hydrochloric acid. The student: ● adds 25.0 cm3 of aqueous potassium hydroxide to the apparatus labelled A in Fig. 1.1 25.0 cm3 aqueous potassium hydroxide A B Fig. 1.1 ● adds a few drops of a suitable indicator to the apparatus labelled A ● uses a burette to add dilute hydrochloric acid to the aqueous potassium hydroxide and indicator mixture in the apparatus labelled A.
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1(a)[2]
M1 A (conical) flask
M2 B volumetric pipette
1(b)(i)[1]
so that it can change colour at the end point
1(b)(ii)[1]
methyl orange / thymolphthalein
1(c)[2]
M1: take initial and final (burette) readings
M2 final reading minus initial reading
1(d)[1]
swirl (A) / swirl (the flask) / mix (the contents of A)
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