Question

At 25 C aqueous solutions with a pH of 8 have a hydroxide ion concentration, OH-, of
A) 1x10^-14M
B)1x10^-8M
C) 1x10 ^-6M
D)1M
E)8M

Answer 1

@hereweg0

Calculating the Hydronium Ion Concentration from pH
The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH.

[H3O+] = 10-pH or [H3O+] = antilog (- pH)

( http://www.chem.purdue.edu/gchelp/howtosolveit/Equilibrium/Calculating_pHandpOH.htm#H3O)

Try this formula. Hope this helps. :)

Answer 2

yes it did thanks.

Answer 3

@hereweg0 Great! You're most welcome. Goodluck! :)