Ka, 2Ka and 3Ka is the respective
Question:

Ka, 2Ka and 3Ka is the respective ionisation constants for the following

reactions.

H2S ⇌ H+ + HS–

HS– ⇌ H+ + S2–

H2S ⇌ 2H+ + S2–

The correct relationship between Ka1 , Ka2 and Ka3 is

(i) Ka3 = Ka1 × Ka2

(ii) Ka3 = Ka1 + Ka2

(iii) Ka3 = Ka1 – Ka2

(iv) Ka3 = Ka1 /Ka2

Solution:

Option (i) is the answer.

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