Why don't you clear lime water to make bleach?
Bleaching powder is produced by the reaction of chlorine gas with calcium hydroxide (slaked lime). Because the absolute dry calcium hydroxide does not react with chlorine, chlorine can only be absorbed by calcium hydroxide. For this reason, in industry, chlorination is carried out with hydrated lime containing less than 1% free water, and the chlorine gas used also contains less than 0.06% moisture. The free moisture of the raw material is used to hydrolyze chlorine gas to produce acid (HClO, HCl), and the generated acid is neutralized by slaked lime. Subsequently, depending on the water released from the calcium hydroxide during chlorination, the chlorine continues to undergo hydrolysis, allowing more calcium hydroxide to participate in the reaction process and produce a series of compounds. Bleaching powder is a composite of these compounds.
Bleaching powder is a mixture of calcium hydroxide, calcium chloride and calcium hypochlorite, its main component is calcium hypochlorite [Ca (ClO)], the effective chlorine content is 30%-38%. The bleaching powder is white or greyish white powder or granule, has obvious chlorine odor, is very unstable and has strong moisture absorption, and is easily decomposed by light, heat, water and ethanol. Bleaching powder is dissolved in water, its water solution can make litmus blue, then gradually faded white. In case of carbon dioxide in the air can be free of perchloric acid, in the case of dilute hydrochloric acid will produce a large number of chlorine.
Because the solubility of calcium hydroxide is very small, that is to clarify, lime water content of calcium hydroxide is very small, and industrial production is carried out in large numbers, the CL2 into clear lime water is obviously not feasible. Bleaching powder or bleaching powder is usually made by entering CL2 into lime milk.
