# Why is silver chromate red?

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?

• 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. – orthocresol Dec 7 '15 at 9:25
• If so are there any ways to predict the colour of a compound? – Charlotte Dec 7 '15 at 11:43
• chemistry.stackexchange.com/questions/2547/… – Mithoron Dec 7 '15 at 22:05
• You do not get green color by mixing a blue colored compound and a yellow colored compound. That's not how chemicals work. – Nilay Ghosh Jun 27 at 11:04