Metal Colour of precipitate Ionic Reaction
Calcium, Ca2+ White Ca2+(aq) + 2OH-(aq) => Ca(OH)2(s)
Copper(II), Cu2+ Blue Cu2+(aq) + 2OH-(aq) => Cu(OH)2(s)
Iron(II), Fe2+ Sludgy green Fe2+(aq) + 2OH-(aq) => Fe(OH)2(s)
Iron(III), Fe3+ Reddish brown Fe3+(aq) + 3OH-(aq) => Fe(OH)3(s)
Aluminium, Al3+ White Al3+(aq) + 3OH-(aq) => Al(OH)3(s)
(colourless in excess NaOH) Al(OH)3(s) + 2OH-(aq) => Mg(OH)2(s)
Magnesium, Mg2+ White Mg2+(aq) + 2OH-(aq) => Mg(OH)2(s)
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