1. Pour 50 mL of saturated calcium hydroxide Ca(OH)2 solution into a 125 mL beaker.
DO NOT shake up the stock bottle. It is saturated and solid will be on the bottom.
2. Fold a piece of filter paper into a cone and fit it into a funnel. Your instructor will demonstrate the
folding technique.
3. Pour your calcium hydroxide Ca(OH)2 solution into the paper cone and allow the solution to drip
into a dry 250 mL Erlenmeyer flask.
4. Remember to cover this flask with a 30 mL beaker when you are not pipetting from it.
5. Measure the temperature of your solution with a dry thermometer.
6. Pour 75 mL of EDTA solution into a dry 125 mL Erlenmeyer flask.
7. Rinse a clean burette three times with 2-3 mL portions of this EDTA solution.
8. Fill the burette with the EDTA solution.
9. Into a 250 mL Erlenmeyer flask:
Pipette 10 mL of the filtered calcium hydroxide Ca(OH)2 solution.
Add 2 drops of Eriochrome Black T indicator to the 250 mL Erlenmeyer.
10. Titrate the calcium hydroxide Ca(OH)2 solution with the EDTA solution until the indicator
changes form reddish to a pure blue. Careful, a purplish (reddish-blue) color is not the end point,
but it does show that your are near the end point.
11. Repeat the titration two more times.
How can one create an experiment that will deteremine the Ksp of a solid like Ca(OH)2
1 answer