Potassium chromate
Potassium chromate is a chemical compound. Its chemical formula is K2CrO4. It has potassium and chromate ions.
Properties
[change | change source]It is a yellow crystalline solid. It is an oxidizing agent in an acidic condition. It is toxic though, because it contains chromium in its +6 oxidation state. It can be destroyed by reaction with reducing agents. It is very rarely found in the ground. It reacts with lead nitrate to make lead chromate, a yellow pigment.
Preparation
[change | change source]It is made by reacting chromium trioxide with potassium hydroxide. It can also be made by oxidation of potassium hydroxide and chromium(III) oxide.
Occurrence
[change | change source]Potassium chromate is found very rarely as a mineral. It dissolves easily in water. It is only found in very dry places.
Uses
[change | change source]It is used to test for chloride ions. It can also be used to make lead chromate for paint.
Safety
[change | change source]Potassium chromate is very toxic. It is a carcinogen. It reacts with reducing agents violently when in acid.