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Answer on Physical Chemistry Question for Mokuton

Question #20520
The acid used in a standard hydrogen electrode to provide a 1 mol dm–3 solution of
hydrogen ions is
A ethanoic acid.
B phosphoric(V) acid.
C sulfuric acid.
D hydrochloric acid.
It's either C or D but I don't exactly know which one.
Which is the correct answer and WHY?
Expert's answer
If we are talking about 1 M H+ solution, the C and the D both are correct. If we are talking about 1 M acid solution, only HCl is applicable(D), because it is right only for 0.5 M solution of H2SO4.

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