Brown ring test
The test is carried out with freshly prepared iron (ii) salt which is acidified with dilute tetraxosulphate (vi) acid and then mixed with trioxonitrate, to form a brown ring at the junction of the acid and aqueous layers.
The test is carried out with freshly prepared iron (ii) salt which is acidified with dilute tetraxosulphate (vi) acid and then mixed with trioxonitrate, to form a brown ring at the junction of the acid and aqueous layers.