Question

take some finely chopped onions in a plastc bag along witn some. strips of clean cloth. tie up the bag tightly and leave overnight in the frdge. The cloth strips can now be used to test for acids and bases. Take two of these cloth strips and check their odour. Keep them on a clean surface and put a few drops of dllute Hcl solution on one strip and a few drops of diute NaOH solution on the other.Rinse both cloth strips with water and again check their odour. Note your observations. Now take some dillute vanilla essence and clove oil and check their . odour. Take some dilute HCl solution in one test tube and dllute NaOH. Solution in another. Add a few drops of dilute vanilla essence to both test tubes and shake well. Check the odour once again and record changes in odour, if any. Simlarly, test the change in the odour of clove oil with dllute HCl and dilute NaOH solutions and record your observations.
Tell the observations

Answer 1

Observation:
☆ with onion strips

• the odour vanishes when dipped in NaOH.
•THE odour remains unchanged in HCl.

☆ with clove oil

• The odour vanishes when added into NaOH.
• the odour remains unchanged with HCl.

☆ with vanilla

• The odour vanishes when dropped into NaOH
• The odour remains unchanged with HCl.