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

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Conjugate Acid-Base Pairs
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What defines a conjugate acid-base pair?

Two species differing by one H+H^+

When an acid donates a proton, what does it become?

Its conjugate base

When a base accepts a proton, what does it become?

Its conjugate acid

What is the conjugate base of ethanoic acid (CH3COOHCH_3COOH)?

CH3COO−CH_3COO^-

In CH3COOH+H2O⇌CH3COO−+H3O+CH_3COOH + H_2O ⇌ CH_3COO^- + H_3O^+, what is the conjugate acid of H2OH_2O?

H3O+H_3O^+

How many conjugate pairs are in every acid-base reaction?

Two

What is the conjugate acid of HCO3−HCO_3^-?

H2CO3H_2CO_3

What is the conjugate base of HCO3−HCO_3^-?

CO32−CO_3^{2-}

In HNO3+H2F2⇌H2NO3++HF2−HNO_3 + H_2F_2 ⇌ H_2NO_3^+ + HF_2^-, which pair are conjugates?

HNO3HNO_3 and H2NO3+H_2NO_3^+

What is the conjugate base of H2SO4H_2SO_4?

HSO4−HSO_4^-

What is the conjugate base of HSO4−HSO_4^-?

SO42−SO_4^{2-}

What should you look for when identifying conjugate pairs?

Species differing by one proton only

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