Question

What is the color of `Cu^(2+)` in solution? What is the color of glucose in solution? What the color and formula are of copper (l) oxide?

Answer 1

The `"cupric ion"` has a truly beautiful blue colour in aqueous solution.....

Explanation:

`[Cu(OH_2)_6]^(2+)` gives a blue coloured solution in water:

![https://tse4.mm.bing.net/th?id=OIP.6dvoTueAL8mcvamyGL0e-QDIEM&pid=15.1&P=0&w=300&h=300]()

Very large, macroscopic cyrstals of `[Cu(OH_2)_6]SO_4` can be grown from these solutions:

![https://tse1.mm.bing.net/th?id=OIP.-ayXreQ2xvtq72IqKrD3TwEsD1&pid=15.1&P=0&w=204&h=168]()

And when glucose is dissolved in water, a colourless solution results. On the other hand, `"cuprous oxide"`, i.e. `Cu_2O`, is a brick-red powder, that is insoluble in water.

![https://tse2.mm.bing.net/th?id=OIP.UwdDbLppcRpvtXXwPBxqWAD6D6&pid=15.1&P=0&w=300&h=300]()