The sulfuric acid having chemical formula H2SO4 represents itself heavy, dense liquid of oily texture. It is very hygroscopic, easily mixes up with water, at the same time surely it is necessary to pour acid into water, by no means not on the contrary. One of the strongest acids, especially in the concentrated look and at the increased temperature. How it is possible to distinguish sulfuric acid among other acids and solutions?
Instruction
1. Receive sulfuric acid in various ways among which "contact" is most widespread. As raw materials serve various sulfur-containing ores, mainly, pyrite (sulfide of iron, FeS2). At the first stage of process, as a result of its roasting, SO2 sulfur oxide is formed. Further, this gas is purified from impurity and dust, by oxidation turned into sulphurous SO3 anhydride of which already and sulfuric acid H2SO4 is formed.
2. For example, you were given several samples of liquids among which there is sulfuric acid. First of all, you should make sure that it is valid acid. Certainly, at all not to a probovuyta samples on taste. Serially add to each test tube on a zinc piece. Those test tubes in which impassioned reaction with liberation of gas immediately will begin for certain contain acid.
3. Why you used zinc, but not alkaline or alkaline-earth metal? Yes because they likewise would force out hydrogen and from clear water, and from solution of some salt. Instead of clarity you would only get confused. Zinc allows to define acids precisely.
4. Separate them from other samples and look for, where exactly there is sulfuric acid. For this purpose use characteristic high-quality reaction to sulfate ion. Dobavtev each test tube is a little solution of chloride barium (BaCl2). Reacting with sulfuric acid, it immediately forms a white dense deposit of barium of sulfate (BaSO4), according to such scheme: BaCl2 + = + 2HClVypadenie this deposit indicates BaSO4 by H2SO4 the content of sulfuric acid in the studied sample.