A-LevelChemistryGroup 29701/12 · Oct/Nov 2022 · Q201 Mark
In the diagram, each test-tube W, X, Y and Z contains 25 cm³ of a 0.1 mol dm⁻³ solution of a salt. [Figure 20.1] To test-tubes W and X, 25 cm³ of 0.1 mol dm⁻³ NaOH(aq) is added. To test-tubes Y and Z, 25 cm³ of 0.1 mol dm⁻³ H2SO4(aq) is added. In which of test-tubes W and X does the liquid have the higher pH and which of test-tubes Y and Z has the greater mass of precipitate? [Table 20.2: higher pH, greater mass of precipitate]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AW
Y
BW
Z
CX
Y
DX
Z
✓ Correct answer
A: W Y
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