Chemistry

If the pH of a Ca(OH)2 solution is measured as 9.0, what is the concentration of the Ca(OH)2 solution?

A. 1 * 10^-5 M
B. 1 * 10^-8 M
C. 1 * 10^-9 M
D. 1 * 10^-6 M

I really have no clue

asked by Michael
  1. pH=-log(H)
    H=10^-9
    but OH*H=10^-14
    OH=10^-5

    posted by bobpursley
  2. Thank you!!!

    posted by Michael

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