CAIE A-Level Chemistry A2 25.1.1 Terms Conjugate Acid and Conjugate Base Questions

Practise removing one proton and adjusting charge to write conjugate-base formulae for weak acids.

Exam points

remove one H+ from the acid formula while preserving all other atoms
adjust the species charge by −1 when forming the conjugate base and check the formula

[Maximum number: 1]

Hypophosphorous acid is an inorganic acid.
The conjugate base of hypophosphorous acid is $\mathrm{H}_{2} \mathrm{PO}_{2}^{-}$ .

Give the formula of hypophosphorous acid.

$\mathrm{H}_{3} \mathrm{PO}_{2}$

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