Co(NO3)3 is cobalt(III) nitrate, a chemical compound composed of cobalt in a +3 oxidation state and three nitrate ions (NO3−). It typically appears as a bright red or purple crystalline substance and is soluble in water. Cobalt(III) nitrate is used in various applications, including as a catalyst in chemical reactions and in the production of other cobalt compounds. It should be handled with care due to its potential toxicity and environmental impact.