The copper sulfate solution that will absorb most strongly is 'red'.
Copper(ii) sulfate is an inorganic compound and it is produced by the combination of copper and sulfur.
The molecular formula of this compound is CuSO₄.
When molecules of water become attached to it them it forms hydrous copper sulfate having the molecular formula of CuSO₄·nH₂O.
Here n represents the number of water molecules and ranges from 1 to 7.
It is used to kill microbes, bacteria, algae, fungi, and snails.
Copper (ii) sulfate appears blue because it absorbs red light and reflects blue light.
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