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zz y5 chem is try > qualitative analysis 🌗 > Flashcards

qualitative analysis 🌗 Flashcards

1
Q

Ca2+ observation in NaOH and NH3

A

NaOH: white ppt, insoluble in excess
NH3: no ppt

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2
Q

NH4+ observation in NaOH and NH3

A

NaOH: no ppt. on heating, ammonia gas is evolved
NH3: NIL

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3
Q

Zn2+ observation in NaOH and NH3

A

NaOH: white ppt, soluble in excess
NH3: white ppt, soluble in excess

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4
Q

Al3+ and Pb2+ observation in NaOH and NH3

A

NaOH: white ppt, soluble in excess
NH3: white ppt, insoluble in excess

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5
Q

Cu2+ observation in NaOH and NH3

A

NaOH: light blue ppt, insoluble in excess
NH3: light blue ppt, soluble in excess to form a deep blue solution

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6
Q

Fe2+ observation in NaOH and NH3

A

green ppt, insoluble in excess

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7
Q

Fe3+ observation in NaOH and NH3

A

reddish-brown ppt, insoluble in excess

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8
Q

test for SO4 2- ions

A

add dilute nitric acid followed by aqueous barium nitrate. white ppt formed

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9
Q

test for Cl- ions

A

add dilute nitric acid followed by aqueous silver nitrate. white ppt formed

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10
Q

test for I- ions

A

add dilute nitric acid followed by aqueous silver nitrate. yellow ppt formed

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11
Q

test for CO3 2-

A

add dilute acids, carbon dioxide evolved

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12
Q

test for NO3- ions

A

add dilute NaOH and aluminium foil and warm, ammonia gas produced

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13
Q

test for hydrogen gas

A

gas produced extinguishes a lighted splint with a ‘pop’ sound

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14
Q

test for carbon dioxide gas

A

gas produced forms white ppt in limewater

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15
Q

test for ammonia gas

A

gas produced turns moist red litmus paper blue

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16
Q

test for oxygen gas

A

gas produced relights a glowing splint

17
Q

ZnO colour change

A

yellow when hot, white when cooled

zz y5 chem is try (18 decks)

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