qualitative analysis

[amit]

today while working in lab i got some strange results:-

anions detected:- carbonate, bromide, phosphate

cations:- arsenate (others have not been tested till now)

i was going by vogel and passed H2S in acidified (with HNO3) soda extract of mixture given. arsenate was presipitated(deep yellow) and centrifugated. then ammonium molybadate was to be added in soda extract gained. first it was heated to remove H2S. as soon as molybedate was added instead of yellow (indication of phosphate) solution turned deep blue. what is now in the test tube?