chemical test when adding NaOH and NH3

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29 Terms

1
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NH+4

Test - add few drops of NaOH

Observation - NH3 is produced

2
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What is observed when few drops of NaOH when Cr3+ present

Green precipitate (Cr(OH)3)

3
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What is observed when excess of NaOH is added to sample containing Cr3+

Green solution can be seen

4
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What can be observed when few drops of NH3 is added to sample containing Cr3+

Green ppt (Cr(OH)3)

5
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What is observed when excess of NH3 is added to sample containing Cr3+

Insoluble = no change

6
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What is observed when few drops of NaOH is added to sample containing Fe2+

Green ppt (Fe(OH)2)

7
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What is the observation when excess of NaOH is added to sample containing Fe2+

Insoluble = No change

8
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What is the observation when few drops of NH3 is added to the sample containing Fe2+

Green ppt (Fe(OH)2)

9
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What is the observation when excess of NH3 is added to sample containing Fe2+

Insoluble= no change

10
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What is the observation when few drops of NaOH is added to sample containing Fe3+

Red brown ppt (Fe(OH)3)

11
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What is the observation when excess of NaOH is added to sample containing Fe3+

Insoluble = no change

12
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What is the observation when few drops of NH3 is added to sample containing Fe3+

Red brown ppt (Fe(OH)3)

13
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What is the observation when excess of NH3 is added to sample containing Fe3+

Insoluble = no change

14
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What is the observation when few drops of NaOH is added to sample containing Cu2+

Blue ppt ( Cu(OH)2 )

15
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What is the observation when excess of NaOH is added to sample containing Cu2+

Insoluble = no change

16
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What is the observation when few drops of NH3 is added to sample containing Cu2+

Blue ppt (Cu(OH)2)

17
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What is the observation when excess NH3 is a added to sample containing Cu2+

Deepblue solotuion forms

18
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What is the observation when few drops of NaOH is added to sample containing Al3+

White ppt (Al(OH)3)

19
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What is the observation when excess of NH3 is added to sample containing Al3+

Soluble

20
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What is the observation when few drops ofNH3 is added to Al3+

White ppt (Al(OH)3)

21
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What is the observation when excess NH3 is added to sample containing Al3+

Insoluble= no change

22
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What is the observation when few drops of NaOH is added to sample containing Ca2+

White ppt( Can(OH)2)

23
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What is the observation when excess NaOH is added to ample containing Ca2+

Insoluble = no change

24
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What is the observations when a few drops of NH3 is added to sample containing Ca2+

Not ppt

25
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What is the observation when excess NH3 is added to sample containing Ca2+



26
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What is the observations when few drops of NaOH is added to sample containing Zn2+

White ppt (Zn(OH)2)

27
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What is the observation when excess NaOH is added to sample containing Zn2+

Soluble

28
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What is the observations when few drops of NH3 is a added to sample containing Zn2+

White ppt

29
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What is the observation when excess NH3 is added to sample containing Zn2+

Soluble