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Pure Chemistry Sec 3 > Test for cations > Flashcards

Test for cations Flashcards

1
Q

What are cations?

A

They are positive metal ions and NH4+

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2
Q

Adding aq. NaOH, a little at first and then in excess to NH4+

A

No ppt seen. NH3 produced on warming.

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3
Q

Adding aq. NaOH, a little at first and then in excess to Ca2+

A

White ppt seen. Insoluble in excess aq. NaOH.

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4
Q

Adding aq. NaOH, a little at first and then in excess to Zn2+

A

White ppt seen. Soluble in excess aq. NaOH to form a colourless solution.

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5
Q

Adding aq. NaOH, a little at first and then in excess to Al3+

A

White ppt seen. Soluble in excess aq. NaOH to form a colourless solution.

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6
Q

Adding aq. NaOH, a little at first and then in excess to Pb2+

A

White ppt seen. Soluble in excess aq. NaOH to form a colourless solution.

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7
Q

Adding aq. NaOH, a little at first and then in excess to Fe2+

A

Dirty green ppt. The ppt formed is insoluble in excess aq. NaOH.

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8
Q

Adding aq. NaOH, a little at first and then in excess to Fe3+

A

Reddish brown ppt. The ppt formed is insoluble in excess aq. NaOH.

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9
Q

Adding aq. NaOH, a little at first and then in excess to Cu2+

A

Light blue ppt. The ppt formed is insoluble in excess aq. NaOH.

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10
Q

Adding aq. ammonia, a little at first and then in excess to NH4+

A

Do not test for NH3 gas when aq. ammonia is added.

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11
Q

Adding aq. ammonia, a little at first and then in excess to Ca2+

A

No ppt seen. If the calcium salt is very concentrated, a little white ppt can be seen.

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12
Q

Adding aq. ammonia, a little at first and then in excess to Zn2+

A

White ppt seen. The ppt is soluble in excess aq. ammonia to form a colourless solution.

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13
Q

Adding aq. ammonia, a little at first and then in excess to Al3+

A

White ppt seen. The ppt remained insoluble in excess aq. ammonia.

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14
Q

Adding aq. ammonia, a little at first and then in excess to Pb2+

A

White ppt seen. The ppt remained insoluble in excess aq. ammonia.

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15
Q

Adding aq. ammonia, a little at first and then in excess to Fe2+

A

Dirty green ppt. The ppt formed is insoluble in excess aq. ammonia.

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16
Q

Adding aq. ammonia, a little at first and then in excess to Fe3+

A

Reddish brown ppt. The ppt formed is insoluble in excess aq. ammonia.

17
Q

Adding aq. ammonia, a little at first and then in excess to Cu2+

A

Light Blue ppt. The ppt is soluble in excess aq. ammonia to form a deep blue solution.

Pure Chemistry Sec 3 (8 decks)

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