If $pH=7$ , what are $[H_3O^+]$ , and $[HO^-]$ ?

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Answer 1 · 2017-05-01T06:49:54

$[H_3O^+]=10^-7*mol*L^-1$ .

By definition, $pH=-log_10[H_3O^+]$ .

And so if $pH=7$ , then $[H_3O^+]=10^-7*mol*L^-1$ .

See this site for another treatment of $pH$ , and $pOH$ .

What is $[HO^-]$ in the given solution?

If pH=7pH=7, what are [H_3O^+][H_3O^+], and [HO^-][HO^-]?