qualitative analysis Flashcards by rowan cross

Q

describe the test for ammonium compounds

A

add NaOH
gently heat
place damp red litmus at top of tube (NH3 turns litmus blue)

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Q

describe the test for hydroxides

A

turns red litmus blue

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Q

describe the test for carbonates

A

turns limewater cloudy when bubbled through HCl

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Q

describe the test for sulfates

A

add HCl to remove carbonates
add BaCl2
white ppt forms

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Q

what is the order for qual analysis?

A

carbonate
sulfate
halide

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Q

why is there a specific order for qual analysis?

A

prevents false positives

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Q

iodine in water

A

brown

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Q

iodine in cyclohexane

A

purple

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Q

iodine vapour

A

colour

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Q

bromine in water

A

orange

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Q

bromine vapour

A

orange/brown

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Q

chlorine gas

A

pale green

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Q

silver iodide

A

yellow

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Q

silver chloride

A

white

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Q

silver bromide

A

cream

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Q

phenolphthalein in acid

A

colourless

Q

phenolphthalein in alkali

A

pink

Q

methyl orange in acid

A

red

Q

methyl orange in alkali

A

yellow

Q

potassium dichromate

A

orange

Q

Cr3+ in sulphuric acid

A

green

Q

Fe2+ (aq)

A

pale green

Q

Fe3+ (aq)

A

pale yellow

Q

Cu2+ (aq)

A

blue

Q

Mn2+ (aq)

A

pale pink

Q

Mn(OH)2

A

beige

Q

Cu(OH)2

A

light blue

Q

Cr(OH)3

A

grey green

Q

Fe(OH)2

A

green

Q

Fe(OH)3

A

brown

Q

[Cr(OH6]3-

A

dark green

Q

[Cr(NH3)6]3+

A

purple

Q

[Cu(NH3)4(H2O)2]2+

A

dark blue

Q

end point potassium manganate

A

permanent pink

Q

end point thiosulfate titration

A

colourless from blue/black