Friday, 3 May 2013

Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C. Kf = 3.9 K kg mol−1.


Calculate the mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C. Kf = 3.9 K kg mol−1.
Solution
Given that
Mass of acetic acid, w1 = 75 g
Molar mass of ascorbic acid (C6H8O6), M2 = 6 × 12 + 8 × 1 + 6 × 16 = 176 g mol−1
Lowering of melting point, ∆Tf = 1.5 K
Use same formula again we get
 
w2= 5.08 g
Answer 
Required mass o ascorbic acid =5.08 g
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12 comments:

  1. GP10 June 2017 at 00:25

    Nice thanks a lot

    ReplyDelete
  2. Z3 April 2018 at 22:01

    It is wrong
    In the question it is 1 Celsius and u took 1 Kelvin in the answer

    ReplyDelete
    Replies
    1. Deepali26 May 2018 at 10:16

      1.5 celsius is the depression in freezing point which means it's a difference between temperature and it doesn't matter that difference u take in kelvin is different from difference between degree celsius but here according to our requirements we want difference in kelvin .......hope it helps

      Delete
    2. Unknown6 May 2019 at 21:12

      You bloody fool ,^Tb in Kelvin is equal to ^Tb in Celsius

      Delete
  3. Unknown18 April 2018 at 05:08

    I am not understand your temperature concept

    ReplyDelete
  4. Unknown6 May 2018 at 16:57

    Define the temp. Concept

    ReplyDelete
  5. Unknown24 July 2018 at 07:14

    Many many thanks

    ReplyDelete
  6. Unknown12 August 2018 at 07:02

    Thanks

    ReplyDelete
  7. beauty solutions 30 October 2018 at 07:29

    Thank you for your answer

    ReplyDelete
  8. Unknown9 April 2019 at 09:25

    Perfect procedure as well as answer.

    ReplyDelete
  9. Aanchal Bhagat26 April 2019 at 08:01

    Thanks for the answer

    ReplyDelete
  10. kharizaffar8 December 2021 at 04:24

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    ReplyDelete

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