# Question #231e7

##### 1 Answer

Aug 3, 2017

#### Explanation:

We're asked to find the hydronium ion concentration

At

#ul(K_w = ["OH"^(-)]["H"_3"O"^+] = 1.00xx10^-14color(white)(l)M^2#

Since

#9.0xx10^-2# #M#

we plug that into the equation and solve for

#["H"_3"O"^+] = (1.00xx10^-14color(white)(l)M^2)/(9.0xx10^-2color(white)(l)M) = color(red)(ulbar(|stackrel(" ")(" "1.1xx10^-13color(white)(l)M" ")|)#

rounded to