A student is given a sample in lab which contains one of the ions listed below. After adding a few drops ofsolution to part of the unknown sample, the student got a greyish precipitate. After adding a few drops ofsolution to another part of the unknown sample the student got a black precipitate. Based on these observations the only possible ion in this student’s sample is:

Question

a. F-

b. C2H3O2-

c. SO4 2-

d. S2 -

e. Cl-

Someone help me please,

Answer 1

A student is given a sample in lab which contains one of the ions listed below. After adding a few drops of AgNo3 solution to part of the unknown sample, the student got a greyish precipitate. After adding a few drops of Mg(NO3)2 solution to another part of the unknown sample the student got a black precipitate. Based on these observations the only possible ion in this student’s sample is:
Sorry the question is second one

Answer 2

is it S 2- or sulfide

Answer 3

The problem doesn't make sense to me and I'm an analytical chemist. Ag2S is black to black/brown and MgS is soluble. The only ions that will form any kind of ppt with AgNO3 (from those listed) is AgCl (white), Ag2S (black). Of those two, Mg(NO3)2 will not form ANY ppt (much less a black one), with either. Maybe I've missed something.

Answer 4

Can u please
explain in much detail, i could not find the answer