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Chemistry > Ion Tests > Flashcards

Ion Tests Flashcards

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1
Q

Test for carbonate ions

A

Add aqueous acid

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2
Q

Positive result for carbonate ions

A

CO2 formed
Bubble through limewater
Limewater turns cloudy

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3
Q

Equation for bubbling CO2 through limewater

A

CO2 + Ca(OH)2 —> CaCO3 (precipitate) + H2O

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4
Q

Test for sulfate ions

A

Acidify with dilute HCl

Add barium chloride

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5
Q

Positive result for sulfate ions

A

White precipitate forms

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6
Q

Equation for test for sulfate ions

A

Ba2+ + SO42- —> Ba2+SO42-

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7
Q

Test for ammonium ions

A

Add NaOH
Warm mixture
Test gas with damp litmus
red litmus paper turns blue

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8
Q

Positive result for ammonium ions

A

Litmus paper goes from red to blue

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9
Q

Equation for ammonium test

A

NH4+ + OH- —> NH3 + H2O

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10
Q

Test 1 for halide ions

A

Add dilute HNO3 (to remove impurities)

Add silver nitrate

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11
Q

Results for test 1 for halide ions

A

Cl- white precipitate
Br- cream precipitate
I- yellow precipitate

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12
Q

Test 2 for halide ions

A

Add dilute NH3

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13
Q

Results for test 2 for halide ions

A

Cl- dissolves
Br- remains
I- remains

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14
Q

Test 3 for halide ions

A

Add concentrated NH3

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15
Q

Result for test 3 of halide ions

A

Cl- dissolves
Br - dissolves
I- remains

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16
Q

Test for cations

A

Add ammonia/NaOH

17
Q

Results for cations

A 
Cu2+ blue 
Fe2+ green 
Cr3+ green (in excess NH3 will turn purple) 
Fe3+ brown 
Mn3+ brown/pink
18
Q

How would you confirm that no other halide ions are present

A

Add dilute NH3 and precipitate completely dissolves

Chemistry (15 decks)

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