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chemistry > identification tests > Flashcards

identification tests Flashcards

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1
Q

carbonate test

CO3 2-

A

add dilute acid
effervesence
carbon dioxide produced

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2
Q

sulfate test

SO4 2-

A

add dilute nitric acid

add aqueous barium nitrate

WHITE PPT`

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3
Q

chloride test

A

add dilute nitric acid

then aqueous silver nitrate WHITE PPT

dissolves in dilute ammonia - colourless solution

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4
Q

bromide test

A

add dilute nitric acid

then aqueous silver nitrate —— cream ppt

dissolves in conc ammonia but not dilute ammonia

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5
Q

iodide test

A

add dilute nitric acid

then aqueous silver nitrate ——- yellow ppt

does not redissolve in ammonia

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6
Q

iron II test

(Fe2+)

A

NaOH

green ppt

insoluble in excess

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7
Q

Fe III test

(Fe 3+)

A

add NaOH

orange-brown ppt

insoluble in excess

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8
Q

copper (Cu2+) test

A

NaOH —– blue ppt

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9
Q

calcium (Ca2+) test

A

NaOH — white ppt

INSOLUBLE IN EXCESS

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10
Q

aluminium test (Al3+)

A

NaOH —- white ppt

REDISSOLVES IN EXCESS

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11
Q

test for aldehydes

A

Tollens’ Reagent — produces silver mirror from colourless solution

Fehling’s Solution — blue to red

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12
Q

test for alcohol

A

add acidified potassium dichromate K2Cr2O7

ORANGE to GREEN

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13
Q

solubility of nitrates

A

all nitrates are soluble

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14
Q

solubility of group 1 + ammonium ions

A

all soluble

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15
Q

solubility of chlorides

A

all soluble except for

Ag silver
Pb lead
Hg mercury

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16
Q

solubility of hydroxides

A

all hydroxides are insoluble EXCEPT FOR

Gp 1 hydroxides
ammonium
barium
strontium

17
Q

solubility of metal carbonates

A

all insoluble EXCEPT FOR

gp 1 + ammonium

18
Q

test for sulfate ion

A

add nitric acid (to remove carbonate ions so no other ppt forms)
add barium chloride
barium sulfate forms — white ppt

chemistry (9 decks)

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