What is ammonium dichromate?

Ammonium dichromate, chemical formula (NH4)2Cr2O7, is an inorganic compound that is typically used in pyrotechnics, photography, and as a corrosion inhibitor. It appears as bright orange crystals or powder with a strong odor of ammonia.

When heated, ammonium dichromate decomposes exothermically to produce nitrogen gas, water vapor, and chromium oxide. This decomposition reaction is often used to create impressive chemical volcano demonstrations in classrooms due to the vigorous redox reaction that occurs.

Ammonium dichromate is considered toxic and carcinogenic, so it should be handled with care and proper safety precautions. It is also water-soluble and should be stored in a cool, dry place away from heat and direct sunlight.

Overall, ammonium dichromate is a versatile compound with a range of applications in various industries, but it should be used with caution due to its hazardous nature.