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Question

The first and second dissociation constant of an acid H2A are 1.0×105 and 5.0×1010 respectively. The overall dissociation constant of the acid will be:
 
  1. 5.0×1015
  2. 0.2×105
  3. 5.0×105
  4. 5.0×1015


Solution

The correct option is A 5.0×1015
H2AHA+H+K1=1.0×105=[H+][HA]H2AHAH++A2K2=5.0×1010=[H+][A2][HA] 
Overall reaction: H2A2H++A2 Koverall=[H+]2[A2]H2A=K1×K2Koverall=5×1015

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