The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

This discussion is now closed.

Check out other Related discussions

Test for water

I think a positive test for water is using cobalt chloride and it turning from blue to pink.

Water will also turn white anhydrous copper(II) sulphate crystals blue...

please can someone check if these are correct and any chemical equations that are produced.
Reply 1
Avatar for Flugtag
Flugtag
or you could boil it at 100 oC
Reply 2
Avatar for bon
bon
2
Yes, your examples given area correct.
Reply 3
Avatar for john171
john171
11
Hey,

I think what you're talking about is a transition metal ion bonded to 6 water ligands.

The color of the hexaqua complex for cobalt 2+ is pink.

{Co(H2o)6}2+ (Hexaqua complex)

So yes, in a way, cobalt 2+ would be a good test for water :smile:
Reply 4
Avatar for sufiankane
sufiankane
2
for cobalt chloride.

CoCl2 + 6H2O--> [Co(H2O)6]2+ + Cl2.

I think the above reaction is right. CoCl2 is blue in colour, and since cobalt chloride changes colour with different ligands as it is a transistion metal so turns pink in the +2 oxidation state. if you are in GCSE or AS level ignore the part about transisiton elements, you do not need to knwo it until A2.

Copper sulphate

CuSO4 + xH2O --> CuSO4.xH2O

The x represents number of water molecules. I do not know what it is, and the . represents that it is in a lattice with it, with ligands, once again transisiton chemistry.

Related discussions

Latest

Trending

Trending

Articles for you