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If a solution of Ca(OH)2 has a pH of 12.31 how can I calculate the concentration of calcium hydroxide in mol L-1 ?

Write the dissociation equation:

Ca(OH)2 >>Ca+ + 2OH

So the concentration of the OH ion is twice the Ca(OH)2 .

Find the concentration of the OH ion

[H+]= antilog (-pH}

then [OH]= 1E-14/H+

Then [Ca(OH)2] = 1/2 [OH-]

  • Chemistry -

    note: pH +pOH = 14
    Which becomes. 12.31 + pOH = 14,
    POH = 14-12.31, = 1.69.
    But pOH = -log[OH^-]
    So 1.69=-log[OH^-]

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