February 23, 2017

Homework Help: Chemistry

Posted by Fiona on Monday, May 21, 2007 at 8:57am.

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-]

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