An unknown solid is entirely soluble in water. On addition of dilute HCl, a prec

Question

An unknown solid is entirely soluble in water. On addition of dilute HCl, a precipitate forms. After the precipitate is filtered off, the pH is adjusted to about 1 and H2S is bubbled in; a precipitate again forms. After filtering off this precipitate, the pH is adjusted to 8 and H2S is again added; no precipitate forms. No precipitate forms upon addition of (NH4)2HPO4. The remaining solution shows a yellow color in a flame test.

Based on these observations, which of the following compounds definitely present: CdS, Ph(NO3)2, HgO, ZnSO4, CD(NO3)2, and Na2SO4?

Explanation / Answer

A) might be present: Pb(NO3)2 Cd(NO3)2 Na2SO4 B) definitely present: unfortunately I got this part completely wrong after trying different combinations of the above 3. maybe you'll have better luck lol!

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