write three chemical equations for the ring test for nitrate radical assuming the salt is potassium nitrate.
Answers
To perform the ring test, wheels should be tapped gently with a light nonmetallic implement, such as the handle of a screw driver for light wheels, or a wooden mallet for heavier wheels. Tap wheels about 45 degrees each side of the vertical line and about 1" or 2" from the periphery. The overall reaction is given below: Reduction of the nitrate ion, oxidation of iron(II) and reduction of nitric oxide. This test is quite sensitive till 2.5 micrograms and a concentration of one in twenty-five thousand parts. The overall reaction is the reduction of the nitrate ion to nitric oxide by iron(II), which is oxidised to iron(III), followed by the formation of a nitrosyl complex between the nitric oxide and the remaining iron(II), where nitric oxide is reduced to NO−. A brown ring will forms at the junction of the two liquids. This is nItroso Ferrous Sulphate (FeSO4. NO). Nitric Acid (Nitrate) reduces Ferrous to Ferric and itself is reduced to nitrogen monoxide (NO).