Question

Plz tell the ans. Its urgent!!!!!!!!

Answer 1

For obtaining correct observations, following precautions should be kept in mind:

1. Always use freshly prepared KOH solution and as KOH is corrosive so handle it carefully.
2. The experiment set up must be air-tight.

Hopefully it helps. Thanks.

Answer 2

All conneCtions be air tight
freshly prepared KOH solution is used