When solute dissolve we cannot see them in the solution. Why?
When SOME solutes dissolve, we cannot see them in solution.........
And when other solutes dissolve, we can see them in solution, because the light reflects the opposite end of the visible spectrum that the salts absorb.
Typically, transition metal salts, in aqueous solutions, are coloured, and they reflect the light from the opposite end of the spectrum to which they absorb.