Consider the following half cell reaction:

The reaction was conducted with the ratio .

The pH value at which the EMF of the half cell will become zero is (nearest integer value).

Given: Standard

Question

Consider the following half cell reaction:

The reaction was conducted with the ratio .

The pH value at which the EMF of the half cell will become zero is  (nearest integer value).

Given: Standard half cell reduction potential  V,  V

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Strategy:
 Set the Nernst Equation for the dichromate half-reaction to zero and solve for the  concentration.

Step 1: Setup Nernst Equation
Reaction: , .
Ratio: .

Step 2: Solve for pH

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