Write the balance reaction. Dicromate ion in aqueous acidic medium with ferrous ion to give ferric and chromium ion. ?

Question

Answer

Answer

Balance Reaction of Dicromate Ion with Ferrous Ion in Aqueous Acidic Medium to Give Ferric and Chromium Ion

The reaction can be represented as:

Cr₂O₇2- + 6Fe²⁺ + 14H⁺ → 2Cr³⁺ + 6Fe³⁺ + 7H₂O

Explanation

The dicromate ion (Cr₂O₇2-) is an oxidizing agent, which means it accepts electrons and gets reduced in the reaction.

The ferrous ion (Fe²⁺) is a reducing agent, which means it donates electrons and gets oxidized in the reaction.

The reaction takes place in an acidic medium, which means there are excess hydrogen ions (H⁺) present in the solution.

During the reaction, the dicromate ion accepts six electrons and gets reduced to chromium ion (Cr³⁺).

At the same time, the ferrous ion donates six electrons and gets oxidized to ferric ion (Fe³⁺).

The excess hydrogen ions in the solution react with water to form hydronium ions (H₃O⁺).

Therefore, the balanced equation shows that two dicromate ions react with six ferrous ions and fourteen hydrogen ions to give two chromium ions, six ferric ions, and seven water molecules.

This reaction is often used in analytical chemistry to determine the concentration of ferrous ions in a solution by titrating it with a known concentration of dicromate ion. The reaction is complete when all the ferrous ions have been oxidized to ferric ions, as indicated by a color change from pale green (ferrous ion) to reddish-brown (ferric ion).

Similar Class 12 Doubts

Balance the reaction. Dicromate ion in aqueous acidic medium with ferrous ion to give ferric and chromium ion .by ion electron method?

Acidified potassium dicharomate is treated with hydrogen sulphide. In the reaction the oxidation number of chromium

When an alkali is added to an orange red solution of dichromate, it forms

In reaction between chloroethane and aqueous sodium hydroxide identify the attacking nucloephile and atom in the chloroethane molecule being attacked.?

Top Courses for Class 12

Suggested Free Tests

Related Content

Schools

Competitive Examinations

Quick Access Links

Technical Exams