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Flashcards in Tests Deck (17):
1

Test for Aldehyde + equation

Tollen's reagent produces silver mirror
RCHO + [O] → RCOOH

2

Test for Ketone/Aldehyde

Brady's reagent produces orange precipitate

3

Test for Carboxylic acid + equation

Fizzing/effervescence
2RCOOH + Na₂CO₃ → 2RCOONa + CO₂ + H₂O

4

Test for Alcohol + equation

Acidified potassium dichromate shows a colour change of orange to green
ROH + [O] → RCHO + H₂O.
ROH + 2[O] → RCOOH + H₂O.

5

Test for potassium

Flame test showing lilac colour.

6

Test for calcium

Flame test showing orange colour.

7

Test for sodium

Flame test showing yellow colour.

8

Test for copper

Flame test showing light blue colour.

9

Test for boron

Flame test showing green colour.

10

Test for Haloalkane

Heat with NaOH (aq) add ethanol and acidify with nitric acid. You then add silver nitrate solution to check for respective halogens from the colour of precipitate.

11

Test for Alkene

Mix with bromine water which changes the colour from orange to colourless.

12

Test for carbonate

React with acid and use calcium hydroxide to observe it going from clear to cloudy.

13

Recrystallisation

Recrystallise, dissolve impure solid in a minimum volume of hot water/solvent, cool solution and filter the solid, wash with cold water and dry.

14

Redistillation

Use a separating funnel to separate organic from aqueous solution. Dry with anhydrous salt like CaCl₂ and go through with redistillation.

15

Purification

The impure mixture is heated is then cooled and filtered through under reduced pressure.

16

Test for NH₄⁺ and Nitrate

Add warm NaOH and observe the gas turning the litmus paper blue.

17

Test for Sulphate

Add Barium Chloride solution and observe a white precipitate forming.