How is lime water prepared?
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Limewater is prepared by stirring calcium hydroxide in pure water and filtering off the excess undissolved Ca(OH)2. When excess calcium hydroxide is added to limewater, a suspension of calcium hydroxide particles results, giving it a milky aspect, in which case it has the common name of milk of lime.
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Shake 5 g calcium oxide (CaO) with 100 mL water. Allow it to stand for about 24 hours. Decant the supernatant iquid and use it for the tests. It is suggested to always use freshly prepared lime water.
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