2 You will determine the enthalpy change for the reaction of magnesium oxide with water to form magnesium hydroxide.
MgO(s) + H2O(l) → Mg(OH)2(s)
The procedure will involve two experiments, one with magnesium oxide and the other with magnesium hydroxide. In each case you will react the solid with hydrochloric acid.
FA 6 is magnesium oxide, MgO.
FA 7 is 2.0 moldm⁻³ hydrochloric acid, HCl.
FA 8 is magnesium hydroxide, Mg(OH)2.

Q: What topic does this question test?

This question tests Chemical energetics in A-Level Chemistry (syllabus code 9701). It is worth 12 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2023 examination, Paper 3 Variant 3 (9701_w23_qp_33.pdf).

Question

2 You will determine the enthalpy change for the reaction of magnesium oxide with water to form magnesium hydroxide.
MgO(s) + H2O(l) → Mg(OH)2(s)
The procedure will involve two experiments, one with magnesium oxide and the other with magnesium hydroxide. In each case you will react the solid with hydrochloric acid.
FA 6 is magnesium oxide, MgO.
FA 7 is 2.0 moldm⁻³ hydrochloric acid, HCl.
FA 8 is magnesium hydroxide, Mg(OH)2.

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