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Pure Chemistry Sec 3 > Test for anions > Flashcards

Test for anions Flashcards

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1
Q

What are anions?

A

They are negative ions

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2
Q

What are the tests and observations for Carbonates?

A

Test: Add dilute HCl
Observations: Effervescence(CO2) produced.

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3
Q

What are the tests and observations for Sulfites?

A

Test: Add dilute HCl
Observations: Effervescence(SO2) produced on warming.

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4
Q

What are the tests and observations for Nitrates?

A

Test: Add aq. NaOH an a little aluminium powder/foil. Warm gently.
Observations: Vigorous effervescence seen. Ammonia gas produced turned moist red litmus paper blue.

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5
Q

What are the tests and observations for Sulfates?

A

Test: Add dilute HCl then aq. BaCl2/add dilute HNO3 then aq. Ba(NO3).
Observations: White ppt (BaSO4) formed. The ppt is insoluble in the acid.

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6
Q

What are the tests and observations for Chlorides?

A

Test: Add dilute HNO3 then aq. AgNO3
Observations: White ppt (AgCl) formed. The ppt is insoluble in the acid.

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7
Q

What are the tests and observations for iodides?

A

Test: Add aq. PbNO3
Observations: Yellow precipitate (PbI2) formed

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Pure Chemistry Sec 3 (8 decks)

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