Answer to Question #25164 in Physical Chemistry for ston
Solid calcium hydroxide, Ca(OH)2, is dissolved in water until the pH of the solution is 10.23. What is the concentration of calcium ion [Ca2+]?
pH is a measure of the activity of the (solvated) hydrogen ion.pOH is sometimes used as a measure of the concentration of hydroxide ions, OH−, or alkalinity. pOH values are derived from pH measurement.At room temperature pOH ≈ 14 − pH.
The net ionic equation for this process is:
Ca(OH)2 <=> Ca2+ 2 OH-
From this equation you can see that concentration of [OH-] is equal to 2*[Ca2+]