An HCl solution has a pH of 3.10, what is the [H+] in this solution?

7.9 x 10^-18 M
1.3 x 10^-11M
7.9 x 10^-4 M
1.3 x 10^3 M

Answer:
[H+] = 10^-3.10 = 7.94 x 10^-4 M

the third one!

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