English Deutsch Français Italiano Español Português 繁體中文 Bahasa Indonesia Tiếng Việt ภาษาไทย
All categories

3 answers

Potassium dichromate _is_ an oxidant, and can be used to test for reducing substances.

The redox reaction reads

Cr2O7(2-) + 6 e(-) + 14 H+ -> 2 Cr(3+) + 7H2O

and shows that the oxygen of the dichromate requires acid to form water.

2006-06-29 20:49:17 · answer #1 · answered by jorganos 6 · 1 0

Acidified Potassium Dichromate

2016-10-07 08:25:20 · answer #2 · answered by heaberlin 4 · 0 0

Potassium is a reducing agent, since it is used to test for the presence of sulphur dioxide.

As you know, Potassium dichromate is written as Cr2O7. You can see that the Cr ion has been oxidised.

Why oxidised? since Potassiunm dichromate 6 is to test for reducing agents, the former should be oxidised (i.e the addition of oxygen AND increase in the oxidation number of the Cr atom).

An acid will help to liberate the OXIDISED Chromium atom from Cr+6 in Cr2O7 to Cr3+ by providing electrons for the liberation of the bonded oxygen to form water. That's it.

2006-06-30 03:00:38 · answer #3 · answered by javed 2 · 0 0

fedest.com, questions and answers