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Q.

The equilibrium constant for this reaction is approximately 10-3.HPO4-2aq.+HCO3-aq. ⇌H2PO4-aq.+CO3-2aq.Which is the strongest conjugate base in this reaction?

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a

HPO4-2aq.

b

HCO3-aq.

c

H2PO4-aq.

d

CO3-2aq.

answer is D.

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Detailed Solution

Conjugate base of weak acid is strong base.Keq=H2PO4-CO3-2HPO4-2HCO3-=10-3 HPO4-2W.Base+HCO3-W.Acid⇌H2PO4-S.Acid+CO3-2S.Base Since the Keq is very less, equilibrium lies on the L.H.S Equilibrium always moves from strong acid to weak acid. Thus H2PO4- is the strong acid and CO3-2 is the strong base.

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The equilibrium constant for this reaction is approximately 10-3.HPO4-2aq.+HCO3-aq. ⇌H2PO4-aq.+CO3-2aq.Which is the strongest conjugate base in this reaction?