Question

Why do we keep conical flask airtight

Answer 1

Answer:

Answer: we keep the conical flask airtight because that the KOH solution didn't absorb the CO2 of upper half of leaf. KOH solution kept in the test-tube inside the air-tight conical flask absorbs the evolved carbon dioxide released by germinating seeds; thereby creating a partial vacuum in the conical flask.

Answer 2

• No, we cannot get the same result.

• When the conical flask is not closed, some gases will leave out the flask during chemical reaction.