chem- test for cations
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Last updated 3:35 PM on 11/9/22
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15 Terms
1
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Cu2+ & NaOH (aq)
blue precipitate of Cu(OH)2 forms, insoluble in excess NaOH
2
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Cu2+ & NH3 (aq)
blue precipitate of Cu(OH)2 forms, soluble in excess NH3(aq) to give a deep blue solution
3
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Fe2+ & NaOH (aq)
green precipitate of Fe(OH)2 forms, insoluble in excess NaOH
4
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Fe2+ & NH3 (aq)
green precipitate of Fe(OH)2 forms, insoluble in excess NH3
5
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Fe3+ & NaOH (aq)
reddish-brown precipitate of Fe(OH)3 forms, insoluble in excess NaOH
6
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Fe3+ & NH3 (aq)
reddish-brown precipitate of Fe(OH)3 forms, insoluble in excess NH3
7
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Ca2+ & NaOH (aq)
white precipitate of Ca(OH)2 forms, insoluble in excess NaOH
8
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Ca2+ & NH3 (aq)
no visible reaction
9
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Al3+ & NaOH (aq)
white precipitate of Al(OH)3 forms, dissolves in excess NaOH to give a colourless solution
10
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Al3+ & NH3 (aq)
white precipitate of Al(OH)3 forms, insoluble in excess NH3
11
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Pb2+ & NaOH
white precipitate of Pb(OH)2 forms, soluble in excess NaOH to give colourless solution
12
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Pb2+ & NH3 (aq)
white precipitate of Pb(OH)2 forms, insoluble in excess NH3
13
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Zn2+ & NaOH(aq)
gel-like white precipitate of Zn(OH)2 forms, soluble in excess NaOH to give colourless solution
14
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NH4+ & NaOH (aq)
no precipitate, pungent ammonia gas is produced upon warming that turns moist red litmus paper blue
15
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NH4+ & NH3 (aq)
no visible reaction
Note 
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