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QA Flashcards

QA tests. R: represents the thing testing positive

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1
Q

-

Test for hydrogen gas and observation

A
  1. Place lighted splint -> mouth of test tube
    R: lighted splint extinguish w/ pop sound

Do this test when
- wooden splint
- any reactive metal given

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2
Q

Test for carbon dioxide and observation

A
  1. bubble gas -> limewater
    R: white ppt formed -> limewater

Do this test when:
- limewater/aqueous calcium hydroxide given
- carbonate given

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3
Q

co2 test add test reagent in excess, what is the result?

A
  1. add limewater in excess
    R: white ppt. dissolves, clear soln.

Do this test to:
- confirm it is co2 and not something else

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4
Q

Test for oxygen gas

A
  1. Place glowing splint -> mouth of test tube
    R: relights/rekindles glowing splint

Do this test when
- splint provided but no metal provided

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5
Q

Limewater chemical name

A

aqueous calcium hydroxide

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6
Q

what is Qualitative Analysis for?

A

identify unknown salt

LINK
all salts have cation + anion

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7
Q

2 possible water vapour tests

A

first
1. place cobalt(II) chloride paper -> mouth of test tube
R: Blue cobalt chloride paper -> pink

second
1. drop few droplets of liquid -> dehydrated CuSo4 (II)
R: White CuSo4 (II) turn blue

Do not use litmus paper/universal indicator

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8
Q

Test for chlorine gas and result

A

blue litmus paper
Process: put damp blue litmus paper near mouth test tube
R: turns damp blue litmus paper red, bleaches

red litmus paper
Process: put damp red litmus paper near mouth test tube
R: bleaches damp red litmus paper

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9
Q

Test for sulfur dioxide gas and result

A

R: turn aqueous acidified potassium maganate (VII) purple -> colourless

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10
Q

test for aqueous ammonia

A

R: turns damp red litmus paper blue

use red litmus paper to differentiate between aq ammonia and chlorine

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11
Q

is chloride and chlorine the same thing? what is the similarity/difference?

A

Chlorine
- gas
- Cl₂

Chloride
- anion, only present in salt!
- Cl-

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12
Q

list all acidic, alkaline neutral gases tested in QA

A

acidic
- cl2
- co2
- sulfuric (so2)
alkaline
- nh3
neutral
- h2
- o2

P.S.: nitrogen is neutral gas that need know but no test in QA

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13
Q

distinguish between hcl and hno3

A

test for chloride anion

why
- hcl, hno3 both release h+ ion
- cl anion diffrentiator

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14
Q

2 testers for cation

A

aqueous sodium hydroxide
aqueous ammonia

all cations have normal vol. and excess vol. results

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15
Q

zinc effect on aqueous sodium hydroxide (normal + excess)

A

normal
- white ppt.

excess
- soluble in excess -> colourless soln.

EXTRA INFO FOR LAB
(soln. appearance has change when added in excess, as white ppt. dissolves)

MEMO
- zinc
- iron(III)
- iron (II)

have same effect on both testers

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16
Q

zinc effect on aqueous ammonia (normal + excess)

A

normal
- white ppt.

excess
- soluble in excess -> colourless soln.

MEMO
- zinc
- iron(III)
- iron (II)

have same effect on both testers

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17
Q

effect of aq. sodium hydroxide on iron (III) (normal + excess)

A

normal
- red-brown ppt.

excess
- insoluble

MEMO
- zinc
- iron(III)
- iron (II)

have same effect on both testers

18
Q

effect of aq. ammonia on iron (III) (normal + excess)

A

normal
red-brown ppt.

excess
- insoluble

MEMO
- zinc
- iron(III)
- iron (II)

have same effect on both testers

19
Q

effect of aq. sodium hydroxide on iron (II) (norm + excess)

A

normal
green ppt.

excess
insoluble

MEMO
- zinc
- iron(III)
- iron (II)

have same effect on both testers

20
Q

effect of aq. ammonia on iron (II) (norm + excess)

A

normal
green ppt.

excess
insoluble

21
Q

effect of aq. sodium hydroxide on copper(II) (norm + excess)

A

norm
light blue ppt.

excess
insoluble

22
Q

effect of aq. ammonia on copper (II) (norm + excess)

A

norm
light blue ppt.
excess
soluble, give dark blue solution

ppt. dissolves to give dark blu soln. when reagent in excess

23
Q

effect of aq. sodium hydroxide on calcium

A

norm
white ppt.
excess
insol

24
Q

effect of aq. ammonia on calcium

A

norm, excess
no ppt.

25
Q

effect of aq. sodium hydroxide on ammonium

A

norm
ammonia produced, warming

excess
NIL

26
Q

effect of aq. ammonia on ammonium

A

NIL

27
Q

effect of aq. sodium hydroxide on aluminium

SAME AS LEAD(II)

A

norm
white ppt.
excess
soluble -> colourless soln.

all soluble white ppt gives colourless soln.

28
Q

effect of aq. ammonia on aluminium

SAME AS LEAD(II)

A

norm
white ppt.
excess
insoluble

29
Q

anion

test for sulfate

A
  1. acidify w/ dilute nitric acid add aq. barium nitrate
    R: white ppt.

anions have no excess reactant result, do not share reactants unlike cation test

30
Q

anion

test for nitrate

A
  1. add aq. sodium hydroxide
  2. add alumnium foil
  3. warm carefully
    R: ammonia produced
31
Q

anion

test for iodide

A
  1. acidify soln. w/ dilute nitric acid
  2. add aq. barium nitrate
    R: yellow ppt.
32
Q

anion

test for chloride

A
  1. acidify w/ dilute nitric acid
  2. add aq. silver nitrate
    R: white ppt.
33
Q

test for carbonate

A
  1. add dilute acid
    R: efferverscence, carbon dioxide produced
34
Q

all are soluble

when any salt + sodium hydroxide/ammonia, form which salt?

A

____ hydroxide

35
Q

which acid to test for carbonate?

A

nitric acid

IMPORTANT
For all cations, test for carbonate first by adding nitric acid

R: efferverscence

36
Q

which substance dont form base (oxide/hydroxide)

A

gold

rest forms oxide

37
Q

colour of lead(II) iodide ppt.

A

yellow

38
Q

wat if u cancel everything in ionic eqn?

A

You’re likely wrong. Recheck

But if it really really really is, then its NO REACTION OCCURED

39
Q

colour of
1. CuCo3
2. CuO
3. Cu metal
4. rest of Cu(II) COMPOUNDS

A
  1. copper carbonate -> green
  2. copper oxide -> black
  3. copper metal -> brown
  4. all other copper coumpounds -> blue
40
Q

if there is a copper substance, what to write? (given that charge not specified)

A

copper (II) ___

41
Q

another way to craft ionic eqn. for BaSo4 other than cancelling spectator ions

A

Ba+ (cation) + So42- (anion) -> BaSo4

Cation and Anion split, put CHARGES must BALANCE, must follow:
- Metal as an element exists on it’s own
- Cl2, e.g. as an elemtent is diatomic

42
Q

lime water ppt name

A

CaCo3
Calcium Carbonate

Chem (11 decks)

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