Qualitative Analysis for Metallic Elements (Section)An unknown solid is entirely soluble i...
Qualitative Analysis for Metallic Elements (Section)
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. (See Figure) The remaining solution shows a yellow color in a flame test (see Figure). Based on these observations, which of the following compounds might be present, which are definitely present, and which are definitely absent: CdS, Pb(NO3)2, HgO, ZnSO4, Cd(NO3)2, and Na2SO4?
Figure The characteristic yellow light in a sodium lamp results from excited electrons in the high-energy 3p orbital falling back to the lower-energy 3s orbital.
Figure Placed in a flame, ions of each alkali metal emit light of a characteristic wavelength.
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