The pH of a solution is 10. What is its [H^+][H+] concentration?

1 Answer
Aug 15, 2017

[H^+]"/"[H_3O^+]=10^(-10)*mol*L^-1[H+]/[H3O+]=1010molL1

Explanation:

By definition, pH=-log_10[H^+]pH=log10[H+].

In water, under standard conditions, pHpH characterizes the autoprotolysis reaction.......

2H_2OrightleftharpoonsH_3O^+ + HO^-2H2OH3O++HO

K_w=[HO^-][H_3O^+]=10^-14Kw=[HO][H3O+]=1014, we take log_10log10 of BOTH SIDES...

log_10K_w=log_10[HO^-]+log_10[H_3O^+]log10Kw=log10[HO]+log10[H3O+]

And on rearrangement,

underbrace(-log_10(10^-14))_(pK_w)=underbrace(-log_10[HO^-])_(pOH)underbrace(-log_10[H_3O^+])_(pH)

And thus 14=pOH+pH.