CAIE A-Level Chemistry A2 25.1.2 Conjugate Acid Base Pairs Identifying Such Questions

Practise identifying acid donors, conjugate bases and conjugate pairs in aqueous reactions.

Exam points

identify the acid as the proton donor and its conjugate base after loss of one H+
recognise conjugate acid–base species as pairs differing by exactly one proton and adjust charge accordingly

[Maximum number: 2]

(a)

Define conjugate acid-base pair.

[ 1 ]

two species that differ by one proton / $\mathrm{H}^{+}$

(b)

Give the formulas of the conjugate acid and the conjugate base of the hydrogen phosphate ion, $\mathrm{HPO}_{4}{ }^{2-}$ .

\begin{aligned} & \text { conjugate acid of } \mathrm{HPO}_{4}^{2-} \\ & \text { conjugate base of } \mathrm{HPO}_{4}^{2-} \end{aligned}

[ 1 ]

$\mathrm{H}_{2} \mathrm{PO}_{4}{ }^{-}$ AND PO4 ${ }^{3-}$

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