you need
  • - calcium carbonate (carbonate) - in the form of limestone or chalk;
  • - hydrochloric acid (better not to use a concentrated, and diluted, in view of economy and reagent safety);
  • - reaction vessel - two-neck flask with grinds;
  • - separating funnel (drip) with ground joint, suitable in size to the microsection bulb;
  • - glass funnel with a paper filter;
  • - the capacity to drain the resulting solution of calcium chloride, and the capacity to evaporate.
This compound can be synthesized in a variety of ways.In an industrial scale, it is produced mainly as a by-product during the manufacture of soda.Under laboratory conditions - either by thermal decomposition of bleach SaOCl2 or by the acti
on of hydrochloric acid HCl per calcium carbonate (carbonate) CaCO3.
How to get calcium chloride second way?The reaction proceeds so:
SaSO3 + 2HCl = CaCl2 + H2CO3Obrazuyuschayasya while carbonic acid H2CO3 so weak that it almost immediately breaks down into carbon dioxide and water.Therefore, the reaction can be written in final form:
CaCO3 + 2HCl = CaCl2 + H2O + CO2
First Crush calcium carbonate into small pieces.This is to ensure that the reaction took place as fully and quickly.
Then place the crushed pieces of calcium carbonate in the flask.Separating funnel (IV) with hydrochloric acid insert in one of the "throat" of the flask.The second "throat" leave open.
undoing tap funnel, start literally drops surge acid.Immediately you will hear a hissing sound clearly distinguishable, and pieces of calcium carbonate will start to "foam", decreasing in size.Your task - to tide just enough acid to all the pieces of limestone or chalk dissolved, and the foam is no longer formed.This would mean that the entire amount of calcium carbonate unreacted.
Close off, carefully remove the flask from the funnel.The flask should be an aqueous solution of calcium chloride.Filter it (for removal of mechanical impurities), then pour into a special container and evaporate the water.The salt should be cool and keep in a pot with a tight lid closed, as it is very hygroscopic.