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

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. which might be present, might be absent, definitely absent?

Expert Solution

It can be seen that cation which can precipiate in chloride as a group I cation and also as group II cation at pH 1 [acidic pH] with H2S is only Pb^2+

Pb^2+ cannot form precipiate in basic conditios [pH 8]

since calcium and sodium give yellow-red and yellow color fmales, they might be present along with Pb^2+ cation, but all other cations [in the baove table] are definitely absent

queen_honey_blossom answered 10 months ago

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