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chemistry > cation test > Flashcards

cation test Flashcards

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1
Q

Na+

A

NaOH: no ppt formed

NH3: no ppt formed

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2
Q

K+

A

NaOH: no ppt formed

NH3: no ppt formed

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3
Q

NH4+

A

NaOH: no ppt formed, colourless and pungent gas evolved upon warming

NH3: REDUNDANT (no ppt)

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4
Q

Zn2+

A

NaOH: white ppt formed, soluble in excess to form colourless solution

NH3: white ppt formed, soluble in excess to form colourless solution

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5
Q

Al3+

A

NaOH: white ppt formed, soluble in excess to form colourless solution

NH3: white ppt formed, insoluble in excess

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6
Q

Pb2+

A

NaOH: white ppt formed, soluble in excess to form colourless solution

NH3: white ppt formed, insoluble in excess

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7
Q

Ca2+

A

NaOH: white ppt formed, insoluble in excess

NH3: no ppt formed

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8
Q

Cu2+

A

NaOH: pale blue ppt formed, insoluble in excess

NH3: blue ppt formed, soluble in excess to form dark blue solution

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9
Q

Fe3+

A

NaOH: red-brown ppt formed, insoluble in excess

NH3: red-brown ppt formed, insoluble in excess

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10
Q

Fe2+

A

NaOH: green ppt formed, insoluble in excess, turns red-brown upon standing

NH3: green ppt formed, insoluble in excess, turns red-brown upon standing

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chemistry (4 decks)

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