Conjugate Acid-Base Pairs (Leaving Cert Chemistry): Flashcards

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Conjugate Acid-Base Pairs
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Define conjugate acid-base pair

Pair of substances differing by exactly one proton (H+H^+)

When acid donates proton, it becomes...

Its conjugate base

When base accepts proton, it becomes...

Its conjugate acid

Conjugate base of CH3COOHCH_3COOH

CH3COO−CH_3COO^-

Conjugate acid of CH3COO−CH_3COO^-

CH3COOHCH_3COOH

Conjugate acid of H2OH_2O

H3O+H_3O^+

How many protons differ in conjugate pairs?

Exactly one proton

In conjugate pair, which has extra H+H^+?

The acid

Conjugate acid of HCO3−HCO_3^-

H2CO3H_2CO_3

Conjugate base of HCO3−HCO_3^-

CO32−CO_3^{2-}

Conjugate base of H2SO4H_2SO_4

HSO4−HSO_4^- (not SO42−SO_4^{2-})

How many conjugate pairs in acid-base reaction?

Two conjugate pairs

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