At 298 K, a 1 litre solution containing 10 mmol of and 100 mmol of shows a pH of 3.0. Given: , . The potential for the half cell reaction is . The value of x is .

Question

At 298 K, a 1 litre solution containing 10 mmol of  and 100 mmol of  shows a pH of 3.0. Given: , . The potential for the half cell reaction is . The value of x is .

Canvas Classes · Accepted Answer

Strategy:
 Use the half-cell Nernst Equation for the dichromate reduction. Account for all species including the  ions, making the potential highly pH-sensitive.

Step 1: Identify Parameters
Reaction: , .
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Step 2: Apply Nernst Equation

Expected value in answer key context: .

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