Determination of the solubility of calcium hydroxide.

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Determination of the solubility of calcium hydroxide

Apparatus

  • Solid calcium hydroxide
  • 0.4 mol/dm  hydrochloric acid
  • Distilled water
  • Pipette
  • Triple valve rubber pipette filler
  • Conical flask
  • Beaker
  • White tile
  • Clamp and stand
  • Methyl orange indicator

Producing the calcium hydroxide solution

  1. Roughly fill a beaker with 200cm³ of distilled water. This does not need to be accurate because samples will be taken from this.
  2. Add solid calcium hydroxide, a spatula at a time, and stir to aid the dissolving.
  3. Continue to add the calcium hydroxide until no more will dissolve i.e. you can see the solid at the bottom, even after much stirring. The amount of calcium hydroxide needed should be around the value of 0.3g.
  4. Fold a piece of filter paper in half, and in half again and pull one side open to form a cone.
  5. Place this cone inside the funnel.
  6. Set up a container underneath the funnel.
  7. Pour the saturated calcium hydroxide solution through the funnel and into the container beneath. All undissolved calcium hydroxide has now been removed.

At this point it is essential to calculate the molarity of the acid that will be used in the titration.

Setting up the titration equipment

8.Set up the equipment for the titration showed in the diagram below

9. Wash out a conical flask with distilled water.

10. Wash out a 25cm pipette with the calcium hydroxide solution, by drawing up the solution with a pipette filler.

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11.Take a 25cm sample of the calcium hydroxide solution by using a 25cm pipette and a triple valve rubber bulb pipette filler. (See the diagram below)

12.Squeeze the large bulb at the top of the pipette filler and then squeeze valve 1 to draw the liquid up the pipette. If the level of the liquid goes higher than that of the mark for 25cm then squeeze the 2nd valve to release the liquid

13.When the level of the liquid is exactly at the mark (i.e. the bottom of the meniscus ...

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