chemistry

How can one create an experiment that will deteremine the Ksp of a solid like Ca(OH)2

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  1. 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.

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