What are hydrates?

1 Answer
Jan 27, 2017

Answer:

Usually the word refers to salts with water 'built into' their crystals.

Explanation:

Example : Sodium carbonate #Na_2CO_3# forms a white powder. To form larger crystals, it builds in 10 molecules of water into its crystal grid, to give #Na_2CO_3*10H_2O#. This is called the hydrate.

An important hydrate is copper sulfate., because the anhydridic form #CuSO_4# is white, while the hydrate #CuSO_4*5H_2O# is blue. It is thus a reagent for water, because it picks up the water molecules quite easily.
Another one is calcium chloride #CaCl_2#, which will dry damp spaces in your home, forming #CaCl_2*2H_2O#.

Note :
This has nothing to do with carbo hydrates. They are called this way, because the ratio of #H# and #O# in them is always #2:1#, just as in water, while no real water is present.