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Chem 16 > Unknown Analysis Cations > Flashcards

Unknown Analysis Cations Flashcards

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1
Q

I get 1 test tube and added NaOH dropwise. If it turned blue, then it is ______

A

Cu2+

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2
Q

I get 1 test tube and added NaOH dropwise. If it turned orange, then it is ______

A

Fe3+

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3
Q

I get 1 test tube and added NaOH dropwise. If it turned white and did not dissolve upon adding excess, then it is ______

A

Ca2+

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4
Q

I get 1 test tube and added NaOH dropwise. If it turned white and dissolved upon adding excess, then it is ______

A

Zn2+

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5
Q

I get 1 test tube and added NaOH dropwise. If no visible reaction occurred, then it may be ____

A

NH4+

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6
Q

Testing for NH4+

A

Add fresh samples to test tube (5+)
Add NaOH (5+)
Cover with watch glass with litmus paper

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7
Q

NH4+ turns ___ litmus paper to ____

A

red; blue

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8
Q

I get 1 test tube and add excess NH3. If the solution turned deep blue dissolved, then it is ____

A

Cu2+

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9
Q

I get 1 test tube and add excess NH3. If the solution turned dark orange ppt, then it is ____

A

Fe3+

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10
Q

I get 1 test tube and add 1 drop NH3. If the solution has no visible reaction, then it may be ____ or _____

A

Ca2+

NH4+

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11
Q

I get 1 test tube and add excess NH3. If the solution turned cloudy white (dissolved), then it is ____

A

Zn2+

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12
Q

If I added 2 drops of KSCN to a candidate of Fe3+, it turns _____

A

blood red

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13
Q

If I added 2 drops of K3Fe(CN)6 to a candidate of Zn2+, then solutions turns ______

A

yellow ppt

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14
Q

If I added 2 drops of (NH4)2 C2O4 (Ammonium Oxalate) to a candidate of Ca2+, then it turns _______

A

white ppt

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15
Q

Fe3+ candidate: add _______

A

KSCN

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16
Q

Zn2+ candidate: add ______

A

K3Fe(CN)6

17
Q

Ca2+ candidate: add ______

A

(NH4)2 C2O4

18
Q

Fe3+ and KSCN = ______ (color)

A

blood red

19
Q

Zn2+ and K3Fe(CN)6 = _______

A

yellow ppt

20
Q

Ca2+ and (NH4)2 C2O4 = _______

A

white ppt

Chem 16 (6 decks)

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