24. Silver

1. $Cl^-$

$Ag^+$ $+$ $Cl^-$ $\longrightarrow$ $AgCl$ - Cheesy white precipitate - Insoluble in $HNO_3$ - Sensitive to light - Three types of complex formation: $AgCl$ $+$ $2CN^-$ $\longrightarrow$ $Ag(CN)_2^-$ $+$ $Cl^-$ - Dicyanoargentate - Soluble - Colorless - Ag masked for 1.,2.,3.,4. $AgCl$ $+$ $2NH_3$ $\longrightarrow$ $Ag(NH_3)_2^{2+}$ $+$ $Cl^-$ - Diamminesilver - Soluble - Colorless - Ag masked for 1.,4., pas pour 2.,3. $AgCl$ $+$ $2S_2O_3^{2-}$ $\longrightarrow$ $Ag(S_2O_3)_2^{3-}$ $+$ $Cl^-$ - Bis(thiosulfate)argentate - Soluble - Colorless - Ag masked for 1.,4., pas pour 2.,3.

2. $I^-$

$Ag^+$ $+$ $I^-$ $\longrightarrow$ $AgI$ - Light yellow precipitate - Like $Ag_3PO_4$ - Insoluble $HNO_3$ $(\neq Ag_3PO_4)$ - Whitens by $NH_3$ ($Ag_3PO_4$ soluble in $NH_3$ ) - Soluble in $KCN$ - Sparingly soluble in $Na_2S_2O_3$

3. $H_2S$ or $(NH_4)_2S$

$2Ag^+$ $+$ $S^{2-}$ $\longrightarrow$ $Ag_2S$ - Black precipitate - Soluble in $HNO_3$ - Insoluble in excess $(NH_4)_2S$

4. $K_2CrO_4$

$2Ag^+$ $+$ $CrO_4^{2-}$ $\longrightarrow$ $Ag_2CrO_4$ - Red-brown precipitate - soluble in hot $HNO_3$ - Soluble in $NH_3$ - Insoluble in acetic acid

5. $KOH$

$2Ag^+$ $+$ $2OH^-$ $\longrightarrow$ $H_2O$ $+$ $Ag_2O$ - Brown precipitate - Insoluble in excess reagent - Soluble in $HNO_3$ - Soluble in $NH_3$