Question

question 10 of 10
points possible: 1.00
why is it important to twist the rubber stopper snugly into the neck of the erlenmeyer flask?
select one:
to prevent any gas (air or ethanol vapor) from leaking out, which would cause inaccurate pressure readings.
to make it easier to inject the ethanol from the syringe.
to prevent water from the bath from leaking into the flask.
to ensure the temperature probe reads the correct temperature.

Explanation:

Twisting the rubber stopper snugly into the Erlenmeyer flask neck prevents gas (air or ethanol vapor) from leaking out. Leakage can cause inaccurate pressure readings in experiments. The other options about injecting ethanol easier, preventing water - bath leakage, and ensuring temperature probe accuracy are not the main reasons for this action.

Answer:

To prevent any of the gas (air or ethanol vapor) from leaking out, which would cause inaccurate pressure readings.