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Ions Test (Metal Ions (Usually done using \(OH^-\). For example \(NaOH\)…
Ions Test
Metal Ions
Usually done using \(OH^-\). For example \(NaOH\)
Coloured Precipitate
\(Fe^{2+}\) - Green
\(Fe^{3+}\) - Green Blue
\(Cu^{2+}\) - Blue
No Precipitate
\(H^+\)
\(NH_4^+\)
If heat is added, then it forms \(NH_3\)
\(K^+\)
\(Na^+\)
White Precipitate
\(Mg^{2+}\)
\(Zn^{2+}\)
\(Al^{3+}\)
Adding excess
\(Mg^{2+}\) - Does not dissolve
\(Zn^{2+}\) - Dissolves
\(Al^{3+}\) - Dissolves
Using aqueous \(NH_3\)/Ammonia
White Precipitate
\(Zn^{2+}\) - Soluble in excess
\(Al^{3+}\) - Insoluble in excess
\(Pb^{2+}\) - Insoluble in excess
Coloured Precipitate
\(Cu^{2+}\) - Light blue ppt. soluble in excess to form dark blue solution
\(Fe^{2+}\) - Dirty Green ppt. insoluble in excess
\(Fe^{3+}\) Reddish Brown ppt. insoluble in excess
No Precipitate
\(Ca^{2+}\)
\(NH_4^{+}\)