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प्रश्न
\[\ce{K_{a_1}, K_{a_2}}\] and \[\ce{K_{a_3}}\] are the respective ionisation constants for the following reactions.
\[\ce{H2S ⇌ H^{+} + Hs-}\]
\[\ce{Hs- ⇌ H^{+} + S^{2-}}\]
\[\ce{H2S ⇌ 2H^{+} + S^{2-}}\]
The correct relationship between \[\ce{K_{a_1}, K_{a_2}}\] and \[\ce{K_{a_3}}\] is ______.
विकल्प
\[\ce{K_{a_3} = K_{a_1} × K_{a_2}}\]
\[\ce{K_{a_3} = K_{a_1} + K_{a_2}}\]
\[\ce{K_{a_3} = K_{a_1} - K_{a_2}}\]
\[\ce{K_{a_3} = K_{a_1} / K_{a_2}}\]
उत्तर
The correct relationship between \[\ce{K_{a_1}, K_{a_2}}\] and \[\ce{K_{a_3}}\] is \[\ce{K_{a_3} = K_{a_1} × K_{a_2}}\].
Explanation:
\[\ce{H2S -> H^{+} + HS- - K_{a_1}}\]
\[\ce{HS -> H^{+} + S^{2-} - K_{a_2}}\]
\[\ce{H2S -> 2H^{+} + S^{2-} - K_{a_3}}\]
`K_(a_1) = ([HS^-][H^+])/([H_2S])`
`K_(a_2) = ([H^+][S^(2-)])/([HS^-])`
\[\ce{K_{a_3} = K_{a_2} × K_{a_1}}\]
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