Calcium ... What do you know about him?"This metal", - just answer many.And what calcium compounds exist?At this point everyone will start scratching your head.Yes, the sparse knowledge about the past, and about himself calcium too.Okay, let's talk about it later, but now let's look at least three of its compounds - carbonate, calcium hydroxide and sodium.
1. Calcium carbonate
He is a salt, which is formed by calcium and carbonic acid residue.The formula of carbonate - CaCO3.
Properties
has a white powder which is insoluble with water and ethyl alcohol.
Getting calcium carbonate
It is formed during calcination of calcium oxide.For the latter, water was added, and then through the calcium hydroxide solution is carried out carbon dioxide.The reaction products are the desired carbonate and water, which are easily separated from each other.If it is heated, it will split, the products of which are carbon dioxide and quicklime.Upon dissolution of carbonate and carbon monoxide (II) can be prepared in water calcium hydrogen.If we combine the carbon and calcium carbonate, the products of this reaction are calcium carbide and carbon monoxide.
Application
This carbonate - chalk it that we meet regularly in schools and other primary and higher education.Also, they are whitewashed ceilings, paint the tree trunks in the spring and was made alkaline soil in horticulture industry.
2. Sodium Calcium
is a salt of carbonic acid.Has the formula Ca (HCO 3) 2.
Properties
water soluble, like all hydrocarbons.However, it is for a while makes it tough.In living organisms, calcium hydrogen carbonate, and some other salt residue with same consistency regulators have the function of reactions in the blood.
Getting
It is produced by reacting carbon dioxide, calcium carbonate and water.
Application
It is found in drinking water, where its concentration can be different - from 30 to 400 mg / l.
3. Calcium hydroxide
formula - Ca (OH) 2.This compound is a strong base.In various sources it may be to call slaked lime or "fluff".
Getting
formed when calcium oxide interact and water.
Properties
It has a kind of white powder, little soluble in water.With increasing temperature, the numerical value of the last solubility decreases.It also has the ability to neutralize acid formed during the reaction of the corresponding calcium salt and water.If added to it dissolved in water, carbon dioxide, are obtained all the same water, and even calcium carbonate.If you continue to happen barbotatsii CO2 formation of calcium bicarbonate.
Application
They whitewashed room, wooden fences, as well as coated with rafters.With this hydroxide prepared lime mortar, bleach, special fertilizers and lime concrete, and even eliminate the carbonate hardness (softened last).By the substance carried causticisation potassium carbonate and sodium disinfect root canals, tanned skin and cure some plant diseases.Calcium hydroxide is also known as a food additive E526.
Conclusion
Now you understand why in this article I decided to describe these three substances?Because these compounds "meet" each other during the expansion and delivery of each of them.There are many other unrelated matter, but let's talk about them another time.
