uu Betermining the Kp of Calcium Hydroxide 123 To determine the solubility produ

Question

uu Betermining the Kp of Calcium Hydroxide 123 To determine the solubility product constant, K , of solid calcium hydroxide Materials: spot plate transfer pipettes distilled water 0.100 M calcium chloride (CaC2) 0.100 M sodium hydroxide solution (NaOH) 1. 2. 3. 4. Thoroughly wash and dry your spot plate Label the wells of your spot plate #1-12 Using a clean transfer pipette, add 5 drops of distilled water to wells #2-11 Using a clean transfer pipette, add 10 drops of calcium chloride solution to well #1 Draw the solution from well #1 into a transfer pipette and place 5 drops of the solution into well #2. Return the excess solution in the pipette to well #1 Draw the solution from well #2 into a transfer pipette and place 5 drops of the solution into well #3. Return the excess solution in the pipette to well #2 Repeat this process for each of the remaining wells. For well #12 discard the 5 drops into the sink, with running water. 6. 7, 8. With another clean transfer pipette, add 5 drops of sodium hydroxide solution to each of the wells 9. Use the tip of the pipette to mix the solutions well 10. Examine all of the wells for the presence of a precipitate (allow a few minutes for a precipitate to form

Explanation / Answer

The observed Ksp value of calcium hydroxide is 5.5 * 10-6.

We see that at trial number 6 Qsp value is more closer to the standard Ksp value.

Also this is the moment where the reaction is about to establish the equilibrium.

As we can see that after 1 more trial there is no change which shows that reaction attains an equilibrium.

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