test for cations

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6 Terms

1
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ammonium NH4+

NaOH: NH3 gas, red litmus paper blue

NH3: -

2
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calcium Ca2+

NaOH: white ppt. insoluble in excess

NH4: no ppt.

3
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copper(II) Cu2+

NaOH: light blue ppt. - insoluble in excess
NH4: light blue ppt. - soluble in excess, gives a dark blue solution

4
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iron(II) Fe2+

NaOH: green ppt. - insoluble in excess

NH4: green ppt. - insoluble in excess

5
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iron(III) Fe3+

NaOH: red-brown ppt. - insoluble in excess

NH4: red-brown ppt. - insoluble in excess

6
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zinc(II) Zn2+

NaOH: white ppt. - soluble in excess, gives colourless solution

NH4: white ppt. - soluble in excess, gives colourless solution