Cations Flashcards by Mark Evro | Brainscape

Q

How do you test for cations?

A

Using either NaOH of NH3 in solution

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Q

Al 3+ added to NaOH =?

A

White ppt.

Soluble in excess > colorless

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Q

Zn 2+ added to NaOH =?

A

White ppt.

Soluble in excess > colorless

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Q

Ca 2+ added to NaOH =?

A

White ppt.

Insoluble in excess

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Q

Cr 3+ added to NaOH =?

A

Green ppt.

Soluble in excess

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Q

Cu 2+ added to NaOH =?

A

Light blue ppt,

soluble in excess, dark blue

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Q

Fe 2+ added to NaOH =?

A

Green ppt,

Insoluble in excess > Red (5m)

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Q

Fe 3+ added to NaOH =?

A

Red ppt,

Insoluble in excess

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Q

NH4 + added to NaOH =?

A

Ammonia gas is produced

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Q

Al 3+ added to NH3 =?

A

White ppt

Insoluble in excess

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Q

Zn 2+ added to NH3 =?

A

White ppt,

soluble in excess > colorless

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Q

Ca 2+ added to NH3 =?

A

No ppt,

if so insoluble in excess

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Q

Cr 2+ added to NH3 =?

A

Grey-green ppt,

insoluble in excess

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Q

Cu 2+ added to NH3 =?

A

Light blue ppt,

soluble in excess > dark blue

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Q

Fe 2+ added to NH3 =?

A

Green ppt,

insoluble in excess > red

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Q

Fe 3+ added to NH3 =?

A

Red-brown ppt,

insoluble in excess

Q

NH4 + added to NH3 =?

A

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