Question #8a714

1 Answer
Dec 22, 2016

pH=12

Explanation:

[HO^-]=(4*g)/(39.99*g*mol^-1)xx1/(10*L)=0.01*mol*L^-1.

Now pOH=-log_10[HO^-]=-log_10(0.01)=2.0

But pH+pOH=14, and thus pH=12

That pH+pOH=14 is key, and of course it stems from the autoprotolysis equilibrium, [HO^-][H_3O^+]=10^-14.