Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

what is the criteria for fractional distillation?
Asked by SHERIL SINGH | 18 Aug, 2010, 04:04: PM
answered-by-expert Expert Answer
Fractional distillation is done to seprate 2 or miscible liquids for which difference in boiling point is less than  25 K
  • The mixture of two or more liquids with different boiling points is heated to a high temperature..
  • The mixture boils, forming vapor
  • The vapor enters the bottom of a long column that is filled with trays or plates.
    • The trays have many bubble caps in them to allow the vapor to pass through.
    • There is a temperature difference across the various trays , they are hot at the bottom and cool at the top
    • The vapor rises in the column.
    • As the vapor rises through the trays in the column, it cools.
    • When a substance in the vapor reaches a height where the temperature of the column is equal to that substance's boiling point, it will condense to form a liquid.
    • The substance with the lowest boiling point will condense at the highest point in the column; substances with higher boiling points will condense lower in the column.
    • The trays collect the various liquid fractions.

     

    Answered by | 18 Aug, 2010, 05:47: PM

    Application Videos

    Concept Videos

    Multiple Choice Questions Practice Test
    Answered Unanswered My Questions My Answers
    CBSE 9 - Chemistry
    which of the following are solid in liquid ? a)smoke b)sand c)moisture d)dew
    Asked by mailtoparvathyprajith | 12 Feb, 2024, 10:08: AM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    plzzz give me help
    question image
    Asked by arunatijarearuna | 18 Apr, 2022, 05:18: PM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    What is Potassium Bromate?
    Asked by pratish.m1998 | 28 Mar, 2022, 12:23: PM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    pure substance?
    Asked by kittuk23rana | 17 Dec, 2021, 02:08: PM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    experiment ink was stirred in water in test tube I and mustard oil was stirred in waterin test tube II. The test tubes were allowed to stand. Write your observation in each casethat is test tube I and test tube II.Also give a suitable reason for your observation.
    Asked by aaravsharma10041980 | 06 Dec, 2021, 09:58: AM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    valency
    Asked by chaurasiyapawan314 | 24 Nov, 2021, 05:40: PM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    Explain distillation method using two separate liquids and lower boiling point difference Acetone and ethanol
    Asked by raily.lodh | 11 Nov, 2021, 09:10: AM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    Dear students write down the uses of metals and non metals with suitable examples.
    Asked by rehanpinjari94.9dgatl | 11 Oct, 2021, 10:07: PM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    password solution become unsaturated on heating why it's so
    Asked by shivjaiswal30.9dgatl | 02 Oct, 2021, 10:07: PM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    CBSE 9 - Chemistry
    A saturated solution is one in which
    Asked by parths1209 | 17 Sep, 2021, 08:48: AM
    ANSWERED BY EXPERT ANSWERED BY EXPERT
    My Class Videos Tests ₹ Plans Ask a Doubt
    Get Latest Study Material for Academic year 24-25 Click here
    ×