In which solution is the [H3O+] less than 0.250 M?

In which solution is the [H3O+] less than 0.250 M?



A) 0.250 M HC2H3O2 (aq)
B) 0.250 M HF (aq)
C) 0.250 M HCO2 (aq)
D) all of these
E) none of these



Answer: D


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