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Question

A weak acid react with strong base, ionisation constant of weak acid is 104. Find out equilibrium constant for this reaction.

A
1010
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B
1010
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C
109
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D
109
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Solution

The correct option is B 1010
WA+SB WAHA SBBOH
Water Dissociation,
H2OH++OH
Kw=[H+][OH]
Kw=1014
HAH++A
Ka=[H+][A][HA]=104
HA+OHH2O+A
K=[A][H2O][HA][OH]
K=KaKw=1041014=1010

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