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:

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

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.