CAIE A-Level Chemistry AS 7.2.5 Appreciate That Under Standard Conditions Questions

Practise explaining the ions responsible for acidic, neutral and alkaline aqueous solutions under standard conditions using CAIE 9701 AS questions.

Exam points

Explain why aqueous solutions can be acidic, neutral or alkaline under standard conditions.

[Maximum number: 2]

Solid magnesium nitride, $\mathrm{Mg}_{3} \mathrm{~N}_{2}$ , is a crystalline solid.

Explain why the solution produced in the reaction in (c)(ii) has a pH greater than 7. Refer to the products of the reaction in your answer.

M1 due to $\mathrm{OH}^{-}(\mathrm{aq})$

M2 EITHER acid-base reaction of water by ammonia OR dissociation of (some) $\mathrm{Mg}(\mathrm{OH})_{2}$

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