AP EAMCET · Chemistry · Electrochemistry

If hydrogen electrons dipped in two solutions of $pH = 3$ and $pH = 6$ are connected by a salt bridge, the emf of the resulting cell is

A $0.177 V$
B $0.3 V$
C $0.052 V$
D $0.104 V$

Verified Solution

Answer & Solution

Correct Answer

(A) $0.177 V$

Step-by-step Solution

Detailed explanation

For the solution one pH=3 :- pH=-logH+H+= 10-pH=10-3 For the second solution pH=6 :- pH=-logH+H+= 10-pH=10-6 According to the nernest equation :- Ecell=E°Cell-0.0591nlogOxidationReductionEcell=E°cell-0.05911log10-310-6Ecell=0+0.059×3=0.177 Hence, If…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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If hydrogen electrons dipped in two solutions of pH=3 and pH=6 are connected by a salt bridge, the emf of the resulting cell is

Step-by-step Solution

If hydrogen electrons dipped in two solutions of $pH = 3$ and $pH = 6$ are connected by a salt bridge, the emf of the resulting cell is