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Chemistry
Chemistry
Problem
Cobalt chloride paper is used to indicate the presence of water. The colour changes from blue to pink as the ligands change from
Cl
−
\text{Cl}^-
Cl
−
ions to
H
2
O
\text{H}_2\text{O}
H
2
O
molecules. Suggest why the two cobalt complex ions
[
Co
(
H
2
O
)
6
]
2
+
[\text{Co}(\text{H}_2\text{O})_6]^{2+}
[
Co
(
H
2
O
)
6
]
2
+
and
[
CoCl
4
]
2
−
[\text{CoCl}_4]^{2-}
[
CoCl
4
]
2
−
are different colours.
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