colours of transition metals - ions & compounds Watch
like you have hydrated cuso4 is dissolved in water, it forms a blue hexa aqua cu 2+ ions and that is what's responsible for the blue colour of the overall solution the sulphate doesn't affect anything.
but chromium cr 3+ is green when produced in reaction, but as hexa aqua cr3+ it produced violet solution - why?
and how am i supposed to remember of all the compounds if theyre not the same? is there at least a rule or something