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Potential of a hydrogen electrode at a given pH or hydrogen pressure

This type of question, asked 3 times: 27 Jan 2024, 1 Feb 2024, 4 Apr 2024. All 3 questions below, oldest first.

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  1. Question 1

    27 Jan 2024

    148
    The hydrogen electrode is dipped in a solution of pH=3pH = 3 at 25∘C25^{\circ}C. The potential of the electrode will be −____×10−2 V-\_\_\_\_\times10^{- 2}\text{ }V.
    (2.303RTF=0.059 V)\left( \frac{2.303RT}{F}= 0.059\text{ }V \right)

  2. Question 2

    1 Feb 2024

    52
    The potential for the given half-cell at 298 K298\text{ }K is (-)._______×10−2 V\times10^{- 2}\text{ }V.
    2H(aq) ++2e−→H2( g)2H_{\text{(aq)~}}^{+}+ 2e^{-}\rightarrow H_{2}(\text{ }g)
    [H+]=1M,PH2=2 atm\left\lbrack H^{+} \right\rbrack= 1M,P_{H_{2}}= 2\text{ }atm
    (Given: 2.303 RT/F =0.06 V,log⁡2=0.3= 0.06\text{ }V,\log2 = 0.3 )

  3. Question 3

    4 Apr 2024

    31
    What pressure (bar) of H2H_{2} would be required to make emf of hydrogen electrode zero in pure water at 25∘C25^{\circ}C ?

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