Compared to HCO,, HCO, has a A) Higher ka B) Lower Ka C) Lower pka D)...

Question

Question

Compared to HCO,, HCO, has a A) Higher ka B) Lower Ka C) Lower pka D) Higher pka E) Both (A) and (C)

Answer 1

Answer #1

H2CO3 is stronger acid than HCO3- .Ka values are given below.

For H2CO3 , Ka = 4.5×10-7 , pKa = 6.35

Ka of HCO3- = 4.7×10-11 and pKa = 10.33.

[ pKa = - logKa]

So, compare to HCO3- , H2CO3 has higher Ka and lower pKa .

Option A and C are correct.

Answer 2

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