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Depends if you have a Hydroxide [OH^-] or a Hydronium [H3O^+] solution.
The Ph of an acid or base is determined by the concentration of the Hydronium [H30^+]. So just find out [H30^+], then use the equation "-log10[H30^+]. Should be between 1-14.
7= neutral. lower than 7 = acid. higher than 7= base.
If you have a hydroxide to begin with. Ie. NaOH. Then you will have the concentration for the OH, which is = to NaOH. If you get something like Ca(OH)2 then you just multiply your concentration of Ca(OH)2 by 2 to get (concentration)[OH^-].
Then use the equation 10^14M/ [OH^-] to find out [H30^+].
Once you have the [H30^+] just use the -log10[H30^+]

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