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Determining the Solubility of Calcium Hydroxide Introduction Calcium Hydroxide Ca(OH)2 dissolves only slightly to form an alkaline solution. This is a saturated solution often called limewater. The solubility of the calcium hydroxide can be found by titrating the saturated solution against a solution of an acid whose concentration is known. I will be using a sample of limewater, containing approximately 0.015 mol dm-3 of calcium hydroxide, and a solution of Hydrochloric Acid, whose concentration is 0.3 mol dm-3. Choosing an Indicator Strong Acid Weak Acid Hydrochloric Acid Ethanoic Acid Nitric Acid Ethandioic Acid Sulphuric Acid Strong Alkali Weak Alkali Sodium Hydroxide Ammonia Solution Potassium Hydroxide Sodium Carbonate Calcium Hydroxide Sodium Hydrogencarbonate The indicator I must use in this titration will depend on the strength of the acid and alkali I use. I will be using Calcium Hydroxide and Hydrochloric Acid. These are a strong alkali and acid respectively. This means I must use an indicator compatible with a strong alkali and strong acid. The 2 indicators I may use are Phenolphthalein...

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