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- Add 2-3 spatulas of calcium hydroxide into a 500ml stock bottle and make up with distilled water. Give it a really good mix, then allow the solids to settle. You can filter off the solids if you prefer.
- Limewater is saturated calcium hydroxide Ca(OH)2. Add the (solid) calcium hydroxide to water until no more will dissolve and let it settle, preferably overnight, so that the limewater solution is clear. It is recommended to use a couple of dedicated 2.5L Winchesters and always leave some excess solid at the base. When one decants, the solid is stirred up, so having two containers is handy.
- Add 25g of calcium hydroxide solid into 1000ml of distilled water, in a Winchester. Shake and allow to settle, then draw off the clear liquid. Every now and again give it a shake and let settle again. You can keep topping it up with water.
- 1% lime water:
- Dissolve calcium hydroxide into a beaker containing 3/4 of the total final volume of distilled water and agitate using a magnetic stirrer for about 24h. Cover the beaker with glad wrap or watch glass. Once fully dissolved, makeup to final volume and filter the solution to get rid of any undissolved calcium hydroxide. Transferred solution into a sealed container.
- Lime water is approximately a 0.02M solution of Calcium Hydroxide:
- Add 25g of Calcium Hydroxide to one litre of water. Shake and allow to settle.
- Draw off the clear liquid, this is the saturated solution.
- Add more water to the keep the container full, as the solution is used. Shake and allow to settle again. The allows the original solution to be used multiple times.