A galvanic cell is composed of two hydrogen electrodes, one of which is a standard one. In which of the following solutions should the other electrode be immersed to get maximum emf?
Correct answer: D. 0.1 M H2SO4
- A. 0.1 M HCl
- B. 0.1 M CH3COOH
- C. 0.1 M H3PO4
- D. 0.1 M H2SO4
Explanation
The correct answer is 0.1 M H2SO4. This solution provides a high concentration of H+ ions due to its nature as a strong diprotic acid, maximizing the emf of the galvanic cell. In comparison:0.1 M HCl is a strong acid, but as a monoprotic acid, it offers fewer H+ ions than a diprotic acid like H2SO4.0.1 M CH3COOH is a weak acid, resulting in significantly fewer H+ ions, leading to a much lower emf.0.1 M H3PO4 is a polyprotic acid, but it is weaker than H2SO4, and thus, it does not provide as high a concentration of H+ ions.
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