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Which of the following precipitates $K^+$ from its solution?

(a) sodium ferrocyanide
(b) sodium cobaltinitrite
(c) sodium argentocyanide
(d) sodium bicarbonate
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Answer: sodium cobaltinitrite
$Na_3[Co(NO_2)_6] $ (sodium cobaltinitrite) $+ 3KCl \longrightarrow K_3[Co(NO_2)_6] $ (potassium cobaltinitrite, Fischer's salt-yellow ppt.) $ + 3NaCl$
answered Feb 1, 2014 by mosymeow_1

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