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CHEMISTRY > Test Tubes > Flashcards

Test Tubes Flashcards

1
Q

Test for alkene
Reagent
Observation
Reason for observation

A

Bromine water
Colourless
Br2 attaches to alkenes

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2
Q

Test for primary , secondary alcohol and aldehyde

Reagent
Observation
Reason for observation

A

Acidified pottasium dicromate
Oraange to green
Cr is reduced
Alchocol and aldehyde oxidsied

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3
Q

Aldeyhde test

Reagents
Observations
Reason for observations

A

Tollens reagent
Silver mirror
Aldehyde oxidised

Fehlings reagent
Brick red precipitate
Aldehyde oxidised

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4
Q

Carboxylic acid / any acid test

Reagent
Observation
Reason for observation

A

Sodium carbonate
Effeservence
CO2 formed

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5
Q

Test for Ba2+
Reagent
observation
Equation

A

H2SO4
White ppt
Ba2+ + SO42- ———-> BaSO4

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6
Q

Test for SO42-

Reagent
observation
Equation

A

Acidified BaCl2
White ppt
Ba2+ + SO42- ———-> BaSO4

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7
Q

Test for Mg2+
Reagent
observation
Equation

A

NaOH
White ppt
Mg2+ + 2OH- ———-> Mg(OH)2

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8
Q

Test for OH-

Reagent
observation
Equation

A

MgCl2
White ppt
Mg2+ + 2OH- ———-> Mg(OH)2

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9
Q

Test for Cl-

Reagent
observation
Equation

A

Acidified HNO3 & AgNO3
White ppt
Ag+ + Cl- ———-> AgCl

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10
Q

Test for Br-

Reagent
observation
Equation

A

Acidified HNO3 & AgNO3
Cream ppt
Ag+ + Br- ———->AgBr

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11
Q

Test for I-

Reagent
observation
Equation

A

Acidified HNO3 & AgNO3
ywellow ppt
Ag+ + I+ ——-> AgI

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12
Q

Test for AgCl

Reagent
observation
Equation

A

Dillute NH3
AgCl ppt dissolves
AgCl + 2NH3 ———> [Ag(NH3)2]2 + Cl-

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13
Q

Test for AgBr

Reagent
observation
Equation

A

Concentrated NH3
AgBr ppt. dissolves
AgBr(s) + 2NH3(aq) → [Ag(NH3)2]+(aq) + Br−(aq)

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14
Q

Test for NH4+

Reagent
observation
Equation

A

NaOH & heat
Gas released turns red litmus paper blue
NH4+ + OH- ——-> NH3 + H2O

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15
Q

Test for Fe2+

A

NaOH
Green ppt —-> browm on standing air
Formation of [Fe(H2O)4(OH)2]

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16
Q

Test for Cu2+

A

Add NaOH
Blue ppt formed
Formation of Cu(H2O)4(OH)2
Add then excess NH3
Deep blue solution
[CU(H2O)2(NH3)4]2+

17
Q

Test for Fe3+

A

Add NaOH/ NH3
Brown ppt disolves
Formation of Fe(H2O)3(OH)3

18
Q

Test for Al3+

A

Excess NAOH
White ppt
Formation of Al(H2O)3(OH)3

EXCESS NH3
Whitte ppt dissolves to form colourless solution
Formation of [Al(OH)4]−

CHEMISTRY (23 decks)

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