The first and second dissociation constant of an acid H2A are 1.0×10−5 and 5.0×10−10 respectively. The overall dissociation constant of the acid will be:
A
5.0×10−5
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B
5.0×1015
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C
5.0×10−15
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D
0.2×10−5
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Solution
The correct option is C5.0×10−15 H2A⇌HA−+H+∴K1=1.0×10−5=[H+][HA−]H2AHA−⇌H++A2−∴K2=5.0×10−10=[H+][A2−][HA−] Overall reaction: H2A⇌2H++A2−Koverall=[H+]2[A2−]H2A=K1×K2Koverall=5×10−15