Asked by Evelyn

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:

a) F -
b) S2 -
c) Cl -
d) C2H3O2 -
e) SO4 2-
Answered by DrBob222
The question rather vague an there are thousands of chemical reactions with many possibilities. My best guess is b.
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