Advertisements
Advertisements
Question
How would you confirm that a colourless liquid given to you is pure water?
Advertisements
Solution
- Every liquid has a characteristic boiling point. Pure water has a boiling point of 100°C (373 K) at 1 atmospheric pressure.
- If the given colourless liquid boils even slightly above or below 100°C, then the given liquid is not pure water.
- It must boil at a sharp 100°C. Thus, by observing the boiling point, we can confirm whether a given colourless liquid is pure water or not.
APPEARS IN
RELATED QUESTIONS
How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), which are miscible with each other?
Select the correct alternative from the choices given for the following statement:
Components of crude petroleum can be separated by
Give a scientific reason.
A wet cloth is wrapped around a water storage container in summer.
Pure water from impure water
- Give the principle involved in the separation of the mixture
- Give the technique of separation of the mixture.
Choose the correct option.
Which of the following methods can be used to separate two compounds with different solubilities in the same solvent?
What will happen if the upper outlet of the condenser is connected to the tap instead of the lower outlet?
Match the type of mixture of compounds in Column I with the technique of separation/purification given in Column II.
| Column I | Column II |
| (i) Two solids which have different solubilities in a solvent and which do not undergo reaction when dissolved in it. | (a) Steam distillation |
| (ii) Liquid that decomposes at its boiling point | (b) Fractional distillation |
| (iii) Steam volatile liquid | (c) Simple distillation |
| (iv) Two liquids which have boiling points close to each other | (d) Distillation under reduced pressure |
| (v) Two liquids with large difference in boiling points. | (e) Crystallisation |
Two liquids (A) and (B) can be separated by the method of fractional distillation. The boiling point of liquid (A) is less than boiling point of liquid (B). Which of the liquids do you expect to come out first in the distillate? Explain.
Draw a diagram of bubble plate type fractionating column. When do we require such type of a column for separating two liquids. Explain the principle involved in the separation of components of a mixture of liquids by using fractionating column. What industrial applications does this process have?
A mixture of benzene and chloroform is separated by ______.
