Question

Why is the thermometer bulb positioned near the sidearm of the distillation flask instead of being dipped in the solution?
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Answer 1

Answer:

The thermometer is positioned so the bulb is situated just below the sidearm of the 3-way. If the bulb is too the low, the heater would cause the temperature seen to be too high causing premature switching of the collecting flasks.

Explanation:

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