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chemistry > qualitative analysis > Flashcards

qualitative analysis Flashcards

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1
Q

naoh + zn

A

white ppt. dissolves in excess naoh

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2
Q

naoh + al

A

white ppt. dissolves in excess naoh

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3
Q

naoh + pb

A

white ppt. dissolves in excess naoh

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4
Q

naoh + ca

A

white ppt. insoluble in excess naoh

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5
Q

naoh + cu

A

light blue ppt. insoluble in excess naoh

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6
Q

naoh + fe(2+)

A

green ppt. insoluble in excess naoh

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7
Q

naoh + fe(3+)

A

reddish-brown ppt. insoluble in excess naoh

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8
Q

naoh + nh4

A

no ppt formed. on heating, colourless and pungent gas produced turns moist red litmus paper blue. gas is ammonia.

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9
Q

nh3 + zn

A

white ppt. dissolves in excess nh3

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10
Q

nh3 + al

A

white ppt. insoluble in excess nh3

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11
Q

nh3 + pb

A

white ppt. insoluble in excess nh3

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12
Q

nh3 + ca

A

no ppt formed

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13
Q

nh3 + cu

A

light blue ppt. dissolves in excess nh3

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14
Q

nh3 + fe(2+)

A

green ppt. insoluble in excess nh3

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15
Q

nh3 + fe(3+)

A

reddish-brown ppt. insoluble in excess nh3

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16
Q

colour of CuO

A

black

17
Q

colour of Cu

A

reddish brown

18
Q

test for SO4

A

aq. BaCl2 + dilute HCl / aq. Ba(NO3)2 + dilute HNO3 –> white ppt. insoluble in acid
aq. Pb(NO3)2 + dilute HNO3 –> white ppt. insoluble in acid

19
Q

test for CO3

A

dilute acids: effercescne is observed. colourless and odourless gas evolved forms white ppt with limewater. gas is CO2

aq. BaCl2 + dilute HCl / aq. Ba(NO3)2 + dilute HNO3 –> white ppt. dissolves in acid to form colourless solution. effervescence is observed/ colourless and odourless gas produced forms a white ppt with limewater. gas is CO2
aq. AgNO3 and divide the precipitate into 2 separate portions. add dilute HNO3 and add aq. NH3 –> white ppt turns pale yellow on standing. ppt dissolves in dilute acid to form a colorless solution. effervescene is observed. colourless and odourless gas produced forms white ppt with aqueous calcium hydroxide. gas is CO2

chemistry (2 decks)

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