Ammonium chromate

Ammonium chromate

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Names
Other names Ammonium chromate(IV)
Identifiers
CAS Number	7788-98-9
ChemSpider	22997
Properties
Chemical formula	CrH8N2O4
Molar mass	152.07 g/mol
Appearance	yellow crystals
Density	1.90 g/ml
Melting point	185 °C (365 °F; 458 K) decomposes
Solubility in water	24.8 g/100ml (0 °C) 37.36 g/100ml (25 °C) 45.3 g/100ml (40 °C) 70.06 g/100ml (75 °C)
Thermochemistry
Std molar entropy (So298)	657 J/K·mol
Std enthalpy of formation (ΔfHo298)	-1163 kJ/mol
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Ammonium chromate is a salt with the formula (NH₄)₂CrO₄. It forms yellow, monoclinic crystals; made from ammonium hydroxide and ammonium dichromate; used in photography as a sensitizer for gelatin coatings. It's often used in photography, textile printing, and fixing chromate dyes on wool. It is also used as an analytical reagent, catalyst, and corrosion inhibitor. It is soluble in water, and, when applied, can cause irritation in the mucous membrane, eyes, respiratory tract, skin, etc. It may cause skin sensitization after prolonged contact. It is also known to be carcinogenic (cancer-causing), and it can cause tissue ulceration and injury to the liver and kidneys.