Question

What compounds(or anions or cations) will make FeCl3 colourless, when it is added to the initial compound(anion or cation)?

Answer 1

Have you come across a strong reducing agent that reduces Fe+++ to Fe++?
In fact, Fe++ ions are generally very pale green and not completely colourless.

Answer 2

Sn^(2+)?

Answer 3

Exactly! Well done!

Answer 4

Thank you! I was worried about ths question stating Fe3+ becoming colourless