Testube Tests

Question 1

What 2 tests are used for aldehydes?

Answer 1

Fehlings solution
Tollens solution

Question 2

What are the results for the 2 tests for aldehydes?

Answer 2

Fehlings- Brick red precipitate formed
Tollens- Silver mirror solution

Question 3

What is the test for Alcohols?

Answer 3

Add acidified potassium dichromate

Question 4

What is the result when testing for Alcohols?

Answer 4

ACD - colour change from orange to green

Question 5

What is the test for Alkenes?

Answer 5

Shake with bromine water

Question 6

What is the result when testing for Alkenes?

Answer 6

Orange colour turns colourless

Question 7

What is the test for Carboxylic acid?

Answer 7

Add Sodium Bicarbonate (NaHCO3)

Question 8

What is the result when testing for Carboxylic acid?

Answer 8

CO2 is released

Question 9

What 3 steps are used to test for Halogenalkanes?

Answer 9

Add NaOH (aq) and warm
Add NHO3 (aq)
Add AgNO3 (aq)

Question 10

What are the results for the 3 steps when testing for Halogenalkanes?

Answer 10

• Heated NaOH (aq) - hydroxide ion replaces halogen so forms Halide ion (X-) and an Alcohol
• HNO3 (aq) - neutralises excess NaOH
• AgNO3 (aq) - precipitate of AgX formed as has reacted with X-