Copper(II) ions are blue and chromate(VI) ions are yellow therefore copper(II) chromate(VI) would turn out to be green because it's a mixture of blue and yellow.

In the same way, silver ions are colourless while chromate ions are yellow. So shouldn't silver chromate be yellow as well?

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    $\begingroup$ You can't just add colours like that. The ions interact with each other. Lead(II) and iodide ions are both colourless in solution but $\ce{PbI2}$ is yellow. $\endgroup$ – orthocresol Dec 7 '15 at 9:25
  • $\begingroup$ If so are there any ways to predict the colour of a compound? $\endgroup$ – Charlotte Dec 7 '15 at 11:43
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    $\begingroup$ chemistry.stackexchange.com/questions/2547/… $\endgroup$ – Mithoron Dec 7 '15 at 22:05
  • $\begingroup$ You do not get green color by mixing a blue colored compound and a yellow colored compound. That's not how chemicals work. $\endgroup$ – Nilay Ghosh Jun 27 at 11:04

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