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.
Guide
1
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.
2
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
3
First Crush calcium carbonate into small pieces.This is to ensure that the reaction took place as fully and quickly.
4
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.
5
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.
6
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.