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1. $FeCl_3$ (Iron(III) chloride) |
$FeCl_3+SCN^-$ $\longrightarrow$ $FeSCN^{2+}+3Cl^-$ (-> Thiocyanatoiron(III), blood red) |
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2. $Cu^{2+}$ (CopperII)sulfate) |
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$Cu^{2+}$ $+$ $2SCN^-$ $\longrightarrow$ $Cu(SCN)_2$ (-> Black precipitate, copper(II) thiocyanate) By action of $SO_2$, it is reduced to a precipitate of $CuSCN$ (copper(I)thiocyanate, purple) |
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2. $Ag^+$ (Silver nitrate) |
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$Ag^+$ $+$ $SCN^-$ $\longrightarrow$ $AgSCN$ (-> White precipitate, silver thiocyanate) This precipitate is not impeccably soluble in $HNO3$, but results in multiple reactions according concentrations. |