2 One analyzed an unknown solution containing some of Analytical Group I cations

Question

2 One analyzed an unknown solution containing some of Analytical Group I cations according to the procedure presented in this experiment Following was observed A white precipitate results when an unknown Solution s treated with 6 M HCI. After washing, 1 mL of distilled water is added, the precipitate s stirred, and the tube is heated in near-boiling water. After centrifuging, the solution is drawn off and set aside Then 6 M NH3 is added to the precipitate, nearly all of which appears to dissolve (a) Which ion(s) are definitely present? (b) Which ion(s) are definitely absent? (C) Which ion(s) are uncertain (can?t tell from data given)?

Explanation / Answer

Considering the solubility data of all alkali metal chlorides (LiCl, NaCl, KCl, RbCl, CsCl), it can be said that,

K+ ion is definitely present in the sample,

Li, Rb and Cs ions are definitely absent

and Na+ ion is uncertain.

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