The logarithm of equilibrium constant for the reaction is (Nearest integer)

Given:

Question

The logarithm of equilibrium constant for the reaction  is  (Nearest integer)

Given:

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Strategy:
 The equilibrium constant () for a complexation reaction can be found by constructing a galvanic cell where the net reaction matches the equilibrium process.

Step 1: Construct the cell
Reaction: .
Half-reactions:
1.  ()
2.  ()

To get the target reaction, we use (1) as the cathode and reverse (2) as the anode:

Step 2: Calculate log K

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