Why is thermometer placement important in distillation?

Asked By: Levon Herpin | Last Updated: 8th January, 2020
Category: home and garden indoor environmental quality
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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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Also, why should the bulb of the thermometer be placed?

The bulb part of the thermometer is positioned near the side arm of the Y-adaptor so that it monitors the temperature of the vapors. If it is too low, it will be too close to the boiling liquid and will read higher than the true vapor temperature.

One may also ask, why is the exact placement of the thermometer important when measuring a boiling point of a distillate what happens if it is too high or too low? A: •Placing the thermometer too high will lead to a low value for boiling point - be sure all the mercury in the bulb is below the sidearm of the still head. Inadequately clamping the apparatus can be dangerous. Over clamping can be a problem, since it causes stress in the apparatus. Remember to use boiling chips.

In this regard, why should the bulb of the thermometer be located just below the sidearm of the distilling flask?

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.

What happens if the thermometer is too high in distillation?

If the bulb of the thermometer or tip of the thermocouple is placed too high in the condenser, then the hot vapors are likely to condense before they reach the thermometer. This will result in the recorded temperature being lower than the actual boiling temperature of the vapor.

36 Related Question Answers Found

What is the proper location for the thermometer in a distillation setup?

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.

Why is it necessary to prevent the thermometer bulb from touching the coil?

It's important to not touch the sides of the test tube with the thermometer because touching it to the sides of the test tube fractures the glass and does not allow for correct temperature measurements.

Why should the thermometer not touch the bottom of the beaker?

a) It's important to not touch the sides of the test tube with the thermometer because touching it to the sides of the test tube fractures the glass and does not allow for correct temperature measurements.

Why is the bulb of thermometer kept above the surface of water?

The bulb of thermometer is kept above the surface of water while determining the boiling point of water because if the thermometer bulb is dispense into the water then the thermometer will measure the temperature of water not the temperature of water at the boiling state.

Why is the thermometer not placed directly in the liquid?


Why is the thermometer not placed directly in the liquid when measuringthe boiling point? Due to convection currents within the boiling liquid bringing a slight cooler liquid incontact with the thermometer bulb when immersed, the thermometer will read a lower temperature than the boiling point.

What are three important safety rules for distillation?

Always ensure proper ventilation. Alcohol easily diffuses in the air and can explode at the very interaction with a spark or a flame. Avoid using glass containers. Use metal and plastic only.

What are the 3 steps of distillation?

The overall process of alcohol distillation can be summed up into 3 parts: Fermentation, Distillation, and Finishing.

What is a good rate of distillation?

approximately 20 drops per minute

What is the process of distillation?

The process of distillation begins with heating a liquid to boiling point. The liquid evaporates, forming a vapor. The vapor is then cooled, usually by passing it through pipes or tubes at a lower temperature. If these compounds have different boiling points, you can separate them using distillation.

Why does water flow up a condenser?


When water is allowed to flow into the condenser, it surrounds the inner tube and creates a cooling effect. That way when the vapors from the boiling liquid hit the cool area of the Liebig condenser, they condense back to liquid form, which is how the condenser actually works!

What would happen if the opening to air on the vacuum adapter was closed during distillation?

To equalize the pressure. What would happen if the opening to air on the vacuum adapter was closed during distillation? It would build up pressure and burst. Reduce the external pressure to 65 mg Hg within a closed system.

What is the purpose of distillation?

Simple distillation involves refining a liquid through the process of separation. The most common purpose for simple distillation is to purify drinking water of unwanted chemicals and minerals such as salt. There are a variety of machines that distill liquids for the purpose of purification or alteration.

What does it mean if the thermometer temperature suddenly drops in the middle of your distillation?

Answer: The head temperature rises as the vapors of lower-boiling compound fill the distillation head. The temperature drops because the lower-boiling compound finishes distilling before vapors of the higher-boiling compound can fill the distillation head, which then cause the head temperature to rise.

What are the two processes involved in distillation?

Distillation refining consists of two processes of distilling and condensation reflux. Distillation is usually carried out in distillation column, the gas-liquid two-phase flow through the countercurrent contact, the phase heat and mass transfer.

What can go wrong with distillation?


Typical problems: Distillation too fast. The components require time to separate. We need many evaporation-condensation cycles for good separation, and pseudo-equilibrium between vapor and liquid throughout the system.

What are the advantages and disadvantages of simple distillation vs fractional distillation?

Simple distillation Fractional distillation Advantages ? simpler setup than fractional ? faster distillation times ? consumes less energy than fractional distillation ? much better separation between liquids than simple distillation ? can more readily purify complex mixtures than simple distillation Disadvantages ?

What is simple distillation used to separate?

Simple distillation may be used when the boiling points of two liquids are significantly different from each other or to separate liquids from solids or nonvolatile components. In simple distillation, a mixture is heated to change the most volatile component from a liquid into vapor.