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JEE Main 202224 JuneMorning Shift
Exam
JEE Main
Year
2022
Date
24 June
Shift
Morning Shift
Subject
Chemistry
Chapter
Electrochemistry

JEE Main 2022 · 24 June · Morning Shift · Chemistry · Electrochemistry

The cell potential for the following cell Pt | H _ 2 (g)| H ^ +...

The cell potential for the following cell PtPt\left|{H}_{2}\left(g\right)\right|{H}^{+}\left(aq\right) | | {Cu}^{2 +}\left(0 .01 M\right)|Cu\left(s\right) is 0.576V0 . 576V at 298K298K. The pHpH of the solution is (Nearest integer)

(Given : ECu2+/Cuo=0.34V{E}_{{Cu}^{2 +} / Cu}^{o} = 0 . 34V and 2.303RTF=0.06V\dfrac{2 . 303RT}{F} = 0 . 06V)

Correct answer

0

Step-by-step solution

Anode ⇒H2(g)⟶2H+(aq)+2e−⇒ {H}_{2}\left(g\right) ⟶ 2{H}^{+}\left(aq\right) + 2{e}^{-}

Cathode ⇒Cu2+(aq)+2e−⟶Cu(s)⇒ {Cu}^{2 +}\left(aq\right) + 2{e}^{-} ⟶ Cu\left(s\right)

Overall ⇒H2(q)+Cu2+(aq)⟶2H+(aq)+Cu(s)¯⇒ \mathop{{H}_{2}\left(q\right) + {Cu}^{2 +}\left(aq\right) ⟶ 2{H}^{+}\left(aq\right) + Cu\left(s\right)}_{¯}

Ecell°=ECu2+Cu°−EH+H2°=0.34V{E}_{cell}^{°} = {E}_{{Cu}^{2 +} Cu}^{°} - {E}_{{H}^{+} {H}_{2}}^{°} = 0 . 34V

Ecell=Ecell°−0.062log[H+]2[Cu2+]{E}_{cell} = {E}_{cell}^{°} - \dfrac{0 . 06}{2}log\dfrac{{\left[{H}^{+}\right]}^{2}}{\left[{Cu}^{2 +}\right]}

0.576=0.34+0.03[−log[H+]2+log⁡[Cu2+])</p><p>0 . 576 = 0 . 34 + 0 . 03\left[- log{\left[{H}^{+}\right]}^{2} + \log \left[{Cu}^{2 +}\right]\right)</p><p>0 . 576 = 0 . 34 + 0 . 03\left[2pH + \log \left[{Cu}^{2 +}\right]\right]</p><p></p><p>0 . 236 = 0 . 03\left[2pH - 2\right]</p><p></p><p>7 . 866 = 2pH - 2</p><p></p><p>pH = 4 . 93 \approx 5

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