detection of halogens a small portion of sodium fusion extract is acidified with HNO3 and then treated with AGNO3 IF WHITE colour indicate cl, pale yellow indicate br, yellow indicate I.
THEN CHEMICAL EQATION AG++X- GIVES AGX(SILVER HALIDE)
DETECTION OF SULPHUR
small portion of sodium fusion extract FRESLY PREPARED SODIUM NITRO PURSIDE SOLUTION IS ADDED;DEEP VOILET COLOUR IS OBTAINED WHICH INDICATES THE PRESENCE OF SULPHUR
NA2[FE(CN)5NO]+NA2S GIVES NA4[FE(CN)5NO.S]
NA+C+N+S GIVES NASCN(SODIUM THIO CYNATE
NASCN+FECL3 GIVES (FE(SCN))+2 (BLOOD RED COLOUR INDICATION)
DETECTION OF PHOSPHOROUS
NA3PO4+3HNO3 GIVES H3PO4+3NANO3
H3PO4+12(NH4)2MOO4+21HNO3 GIVES (NH4)3PO4.12MOO3+21NH4NO3+12H2O
