Determining the Ksp of Calcium Hydroxide by Titration of Saturated Ca(Oh)2(Aq) with Hcl(Aq)

2028 Words Feb 14th, 2011 9 Pages
Determining the Ksp of Calcium Hydroxide by Titration of Saturated Ca(OH)2(aq) with HCl(aq)

Abstract: Titration is a technique that has been used in this experiment to identify the Ksp value of calcium hydroxide in order to determine the extent to which the compound is soluble in water. A known volume of 50 mL of hydrochloric acid, a concentration of 0.05 M hydrochloric acid, a volume of 50 mL calcium hydroxide base, an unknown concentration of base and an acid-base indicator (bromothymol blue) has been used in this experiment to determine the concentration of calcium hydroxide. From the results tabulated, a Ksp value of 1.26 x 10-7 has been retrieved indicating that
…show more content…
All group members began by setting up the lab by obtaining all required materials and placing them on the lab bench. A buret was then rinsed twice with water and once with HCl(aq). It was then filled with 30 mL of the titrant, HCl(aq). The pipet was rinsed twice with water and once with Ca(OH)2(aq) . The pipet was filled with 10 mL of Ca(OH)2(aq) and then emptied into a flask. 20 mL of water and three drops of indicator was added to the flask containing Ca(OH)2(aq). The flask was then placed under the tip of the buret. The stopcock was rotated which allowed the addition of small amounts of titrant into the flask containing calcium hydroxide solution with bromothymol blue indicator which has a light blue appearance. In each trial, the base was titrated to the endpoint; the endpoint was where the solution in the flask changed colour from light blue to yellow. The buret readings were recorded before and after the titration was completed. Finally, the titration was repeated two more times, resulting in obtained data for all three trials. After the lab was performed, all equipments were washed and dried well by…

More about Determining the Ksp of Calcium Hydroxide by Titration of Saturated Ca(Oh)2(Aq) with Hcl(Aq)