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A water bath is only used when the material to be distilled meats two criteria. The first is that the material would deteriorate if exposed to a temperature above a certain temperature and secondly if he distillation temperature is at or below 100oC.
In the first car it is easier to control the temperature of a large volume of water because of its thermal inertia rather than control the temperature by using direct heat on a small volume of material to be distilled. In addition the water bath avoids local hot spots in the distillation vessel.
The second points obvious in that materials will not distill at temperatures below their own boiling point.
With the advent of reliable electrical heating systems water baths have been superseded with temperature controlled electrical heating systems. All the advantages of a water bath, more precise temperature control and less mess.
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During distillation of ether why you used water bath for heating?
Because ether is highly volatile liquid and easily catch the fire (combustible) so direct heat on flame is not possible.
How would you adapt the apparatus so that a flammable liquid be purified?
a water bath is then needed during distillation
How do you heat bath water with a heating element?
with a submersion heater designed for bath tubs..
Why should a receiver flask in a distillation be in an ice water bath?
The ice water bath is an option designed to cool the distillate to speed and improve condensation, which happens in the receiver flask.
Why water bath must be used while heating ethanol and acetone?
A water bath must be used while heating ethanol and acetone because the temperatures at which they can be heated might break the container they are heated in. Some metals are also heated this way.
How many BTU per bath?
Standard bath is taken to be 20 gallons at 8.35 pounds per gallon and 60 degrees F of heating = 10,000 BTU per bath in round numbers, assuming 100% efficiency water heating.
Is direct heating advisable when evaporating NaCl solution?
no, it is more safe to use water bath :)
What is the advantage of using evaporation by water bath over direct heating method?
The advantage of using evaporation by water bath over a direct heating method is when heating directly, for example, with a Bunsen flame - the substance in the boling tube may decompose upon such an accelerated heating because of variations in the intensity of the flame and then may be scorched, while a water bath provides a constant heating of the subsatnce by distributing heat to the boiling tube equally throughout, so that the substance cautiously gets heated until a fixed point (be it the melting point or boiling point) is reached.
Why must you use hot water bath to melt the naphthalene instead of heating it directly over a flame?
Heating it on a flame will cause possibly dangerous vapour. Hot water avoids this.
Can you boil water in a test tube suspended in a pot of water?
For slow heating with the maximum control, test tubes are heated in a water bath rather than in a flame. This can only heat the tube to the boiling point of water, 100°C or 212 °F.
The skin swells and puckers during a long bath this suggests that bath water is a?
Hypertonic
The skin swells and puckers during a long bath. This suggests that bath water is?
Hypertonic
