Question

Why is the bulb of the thermometer placed next to the sidearm?

Answer 1

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✔✔The position of the thermometer is crucial: The entire mercury bulb must be positioned below the bottom of the orifice leading to the condenser. .

✔✔This ensures that the entire mercury reservoir is immersed in the rising vapors and that the temperature is accurate.

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Answer 2

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Had you dip it in the solution, the thermometer would have measured the temperature of the direct heat from the flame. However, what we want is the temperature at which a substance boils. Hence, by positioning the thermometer near the sidearm of the distillation flask measures the temperature of the vapour which is also the boiling point of that substance.


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