Sodium salt solution + , AgNO_3 solution to C | vedclass

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(C) The reaction of the sodium salt with $AgNO_3$ produces a precipitate of silver salt: $Na_2S + 2AgNO_3 	o Ag_2S \downarrow (	ext{Black}) + 2NaNO_

Vedclass · Accepted Answer

$PO_4^{3-} (aq.)$

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(C) The reaction of the sodium salt with $AgNO_3$ produces a precipitate of silver salt: $Na_2S + 2AgNO_3 	o Ag_2S \downarrow (	ext{Black}) + 2NaNO_3$ $NaI + AgNO_3 	o AgI \downarrow (	ext{Yellow}) + NaNO_3$ $Na_3PO_4 + 3AgNO_3 	o Ag_3PO_4 \downarrow (	ext{Yellow}) + 3NaNO_3$ $NaBr + AgNO_3 	o AgBr \downarrow (	ext{Pale yellow}) + NaNO_3$ Analysis of solubility: $Ag_2S$ is insoluble in both $HNO_3$ and $NH_3$. $AgI$ is insoluble in both $HNO_3$ and $NH_3$. $AgBr$ is insoluble in dilute $HNO_3$ but soluble in concentrated $NH_3$. $Ag_3PO_4$ is soluble in both dilute $HNO_3$ (due to the formation of weak acid $H_3PO_4$) and concentrated $NH_3$ (due to the formation of complex $[Ag(NH_3)_2]^+$). Therefore,the anion present is $PO_4^{3-}$.

Sodium salt solution $+ \, AgNO_3$ solution $\to$ Coloured precipitate: If the coloured precipitate is soluble in both dilute $HNO_3$ and excess concentrated $NH_3$ solution,then which of the following anions is present in the salt solution?

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