User:Enalumenya/Temp/Solubility product.doc

PRACTICAL CHEMISTRY

Determination of solubility product of calciumhydroxide and then solubility of calciumhydroxide in sodiumhydroxide solution.

You are provided with the following:

FA1, which is 0.05M Hydrochloric acid;

FA2, which is sodiumhydroxide solution;

Solid P, which is calciumhydroxide.

You are required to determine the solubility product of calciumhydroxide and then the solubility of calciumhydroxide in sodiumhydroxide solution at room temperature.

Procedure


 * 1) Weigh about 2.5g of P and add 250cm3 of water in a conical flask. Boil the mixture for about 5 minutes and then cool under the tap to room temperature. Filter the mixture and keep the filtrate for subsequent analysis.

Pipette 25cm3 of the filtrate into a clean conical flask and titrate with FA1 using phenolphthalein as indicator.

Repeat the titration two times and record your results in the table below.

Results

Volume of pipette used = ………………….. cm3

Average volume =


 * 1) Weigh about 2.5g of P and add 250cm3 of FA2 in a conical flask. Boil the mixture for about 5 minutes and then cool under the tap to room temperature. Filter the mixture and keep the filtrate for subsequent analysis.

Pipette 25cm3 of the filtrate into a clean conical flask and titrate with FA1 using phenolphthalein as indicator.

Repeat the titration two times and record your results in the table below.

Results

Volume of pipette used = ………………….. cm3

Average volume =

Questions (Ca = 40, O = 16, H = 1)


 * 1) Determine: (a) the solubility product of P.

(b) the solubility of P in g/dm3 in FA2.


 * 1) Comment on your answer in (b) above.