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1. $Ca^{2+}$ (Calcium chloride) |
$Ca^{2+}+C_2O_4^{2-}$ $\rightarrow$ $CaC_2O_4$ - white precipitate - Soluble in $HCl $ - Insoluble in acetic acid ($\neq$ tartrate) |
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2. $Ag^+$ (Silver nitrate) |
$2Ag^++C_2O_4^{2-}$ $\rightarrow$ $Ag_2C_2O_4$ - White precipitate - Soluble in $HNO_3$ |
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3. $Ba^{2+}$ (Barium chloride) |
$Ba^{2+}+C_2O_4^{2-}$ $\rightarrow$ $BaC_2O_4$ - White precipitate - Soluble in $HCl$ |