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(Vihaan) Sciences > Chemistry - Tests for Cations > Flashcards

Chemistry - Tests for Cations Flashcards

1
Q

2 different solutions that can be used (to test for cations) ->

A

Aqueous NaOH and NH3

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2
Q

Dropwise NaOH can result in…

A

Gas production, white precipitate or coloured precipitate

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3
Q

Dropwise NaOH with NH4+ produces…

A

Ammonia gas (which can be tested with damp red litmus)

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4
Q

Dropwise NaOH with Al3+ produces…

A

White precipitate

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5
Q

Dropwise NaOH with Zn2+ produces…

A

White precipitate

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6
Q

Dropwise NaOH with Ca2+ produces…

A

White precipitate

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7
Q

Dropwise NaOH with Fe2+ produces…

A

Green precipitate

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8
Q

Dropwise NaOH with Fe3+ produces…

A

Red precipitate

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9
Q

Dropwise NaOH with Cr3+ produces

A

Grey-green precipitate

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10
Q

Dropwise NaOH with Cu2+ produces…

A

Blue precipitate

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11
Q

Adding excess NaOH has 2 options…

A

Precipitate may redissolve or it may stay

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12
Q

Adding excess NaOH to Al3+ results in…

A

Soluble precipitate

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13
Q

Adding excess NaOH to Zn2+ results in…

A

Soluble precipitate

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14
Q

Adding excess NaOH to Cr3+ results in…

A

Soluble precipitate

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15
Q

Adding NaOH to everything (apart from Al3+, Zn2+ and Cr3+) results in…

A

Insoluble precipitate (the precipitate remains)

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16
Q

Dropwise NH3 can result in…

A

No visible reaction, white precipitate or coloured precipitate

17
Q

Dropwise NH3 with NH4+ results in…

A

No reaction

18
Q

Dropwise NH3 with Ca2+ results in…

A

No visible reaction

19
Q

Dropwise NH3 with Al3+ results in…

A

White precipitate

20
Q

Dropwise NH3 with Zn2+ results in…

A

White precipitate

21
Q

Dropwise NH3 with Fe2+ results in…

A

Green precipitate

22
Q

Dropwise NH3 with Fe3+ results in…

A

Red-brown precipitate

23
Q

Dropwise NH3 with Cr3+ results in…

A

Green precipitate

24
Q

Dropwise NH3 with Cu2+ results in…

A

Blue precipitate

25
Q

Adding excess NH3 in Zn2+ results in…

A

Soluble precipitate (redissolves)

26
Q

Adding excess NH3 in Cu2+ gives…

A

Soluble precipitate
(redissolves).
Dark blue solution is produced

27
Q

Adding excess NH3 in everything (except Zn2+ and Cu2+) gives…

A

Insoluble precipitate (the precipitate stays)

28
Q

(TRIVIA): Produces white precipitate when NaOH is added dropwise, but doesn’t react visibly with any NH3

A

Ca2+

29
Q

(TRIVIA): With NaOH, these ions will form a white precipitate AND redissolve.

A

Zn2+ and Al3+

30
Q

(TRIVIA): With NaOH, this ion forms an insoluble blue precipitate.

A

Cu2+

31
Q

(TRIVIA): This ion produces a green precipitate with drops of NaOH but it is dissolved when more is added.

A

Cr3+

(Vihaan) Sciences (6 decks)

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