Test For COOH group

Question 1

How do you test for a COOH group (Na2CO3)

Answer 1

Add a spatula measure of Na2CO3 (sodium carbonate)

Or sodium hydrogencarbonate

Question 2

Describe a positive test

Answer 2

Gas released
Solid disappears
Bubble gas through limewater and it changes from colourless to milky

Question 3

How do you test for a COOH group (with Mg) and what are the observations for a positive test

Answer 3

Add a strip of magnesium ribbon to a few cm^3 of the liquid
Gas released
Mg disappears
Test gas with lid splint - pop sound