Chromic Acid for Cleaning Agent

Oxidation Reaction of Chromic Acid

For laboratoriest sometimes use chromic acid to clean their glassware after use to prepare chemical reaction or other purpose. The basic on how this acid can clean glass ware is their oxidizing agent to the dirt which stick to the glass. The process of this chromic acid reaction as follows:

HCrO4-    + 3 Fe++ + 7 H+ --->  Cr+++ + 4 H2O
2 HCrO4-  + 6 I- + 14 H+ --->   2 Cr+++ + 3I2 + 8H2O

Chromic acid will oxidized aldehydes to acids and to oxidize secondary alcohol and ketones. Chromic acid also in acetic acid solution can oxidize benzoic acid, ethylbenzene to acetophenone, triphenylmethane to triphenylcarbinol, fluorene to flourene, and chrysese to chrysoquinone. Chromic acid can dissolve in acetic andydride and sulfuric acid, oxidizes o-xylene to be tetra acetated of o-phtalaldehyde.

Chromic acid powder use for analytical purpose
Chromic Acid

Prepare Chromic Acid as Cleaning Agent

The form of chromic acid can be powder and chromic acid is very diluted in water, to make chromic acid for cleaning agent as follows:
  • Chromic acid powder 400 gram
  • Distilled water 4000 ml or 4 liter
  • Sulfuric acid 400 ml
Dissolve chromic acid in water, mixed and stir until all chromic acid dilute in water. Pour the sulfuric acid solution into glass contain of chromic acid slowly. Continuous stir this mixture until all mixture have similar composition with similar color dark brown.

Safety Precaution:

  1. For your heath and safety, please use masker to prepare this solution because chromic acid is toxic if inhale. This fume can irritate our respiratory and reproductive system.
  2. Use google and rubber glove because chromic acid and sulfuric acid can irritate skin and eyes
The source of chromic acid is formed from chromium substance react with water become chromic acid.


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