Solid calcium hydroxide, Ca(OH)2, is dissolved in water until the pH of the solution is 10.23.

Question

What is the concentration of calcium ion [Ca
2+
]?

Answer 1

........Ca(OH)2 ==> Ca^2+ + 2OH^-

pH = 10.23
pOH = 14-10.23 = 3.77
pOH = -log(OH^-) so OH^- is approximately 1.7E-4M.
(Ca^2+) is 1/2 that

Answer 2

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