(c) Once the [OH-I in a saturated solution has been determined, the [Ca2+] and hence the solubility product (Ksp) of Ca(OH)2(s) can be determined as follows. Consider solution (2) again. ca2+ + 2 OH- Ca(OH)2(s)

Note from this equation, [Ca2+] at equilibrium = solubility in mol L -lof Ca(OH)2(s)

Solution (2) contains both NaOH and Ca(OH)2 in solution.

What part of the total [OH-I determined in (b) is due to the dissolved Ca(OH)2?

d) Following from (c) , what is the value of [Ca2+]? (This is also the value of S, the molar solubility of Ca(OH)2 in this solution).

e) Now that both [OH-I and [Ca2+] are known [from (b) and (d) above], calculate ksp for Ca (OH)2