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.Sam.

I'm missing something :p

  • 10 months ago
  • 10 months ago

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  1. .Sam.
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    A sample of ethyl propanoate is hydrolysed by heating under reflux with aqueous sodium hydroxide. The two organic products of the hydrolysis are separated, purified and weighed. Out of the total mass of products obtained, what is the percentage by mass of each product? \(\color{blue}{Ans:}32.4% and 67.6 \)% and \(67.6\)%

    • 10 months ago
  2. .Sam.
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    \[M_r(CH_3CH_2COOCH_2CH_3)=102g/mol\] Separated compounds should be carbox and alcohol right \[M_r(CH_3CH_2COOH)=74g/mol\] \[M_r(HOCH_2CH_3)=46g/mol\] What I've found was 38.3% and 61.7%

    • 10 months ago
  3. mathslover
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    You are correct @.Sam.

    • 10 months ago
  4. .Sam.
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    But the answer is 32.4% and 67.6% :(

    • 10 months ago
  5. mathslover
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    The answer (from wherever it has been taken) is wrong.

    • 10 months ago
  6. mathslover
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    The products of the hydrolysis are correct; the molecular masses are also correct then there is nothing left which could be wrong.

    • 10 months ago
  7. .Sam.
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    Hmm I still can't trust my answer, we'll wait for more opinions from others okay :)

    • 10 months ago
  8. mathslover
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    Best choice. :)

    • 10 months ago
  9. emcrazy14
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    You did a mistake in there. The base hydrolysis of esters results in a sodium salt rather than carboxylic acid itself. So, here you'll get sodium propanoate i.e CH3CH2COONa So your Mr will be 96. Now, your percentage by mass of each product will be: (96/142) x 100= 67.6% (46/142) x 100= 32.4%

    • 10 months ago
  10. .Sam.
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    Oh yeah we're not using \(H_2O\) to hydrolyse that ester, derp... Okay got it, thanks @emcrazy14 :)

    • 10 months ago
  11. emcrazy14
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    yw! :)

    • 10 months ago
  12. mathslover
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    Oh, I did 96 + 46 = 162 :D , good work @emcrazy14

    • 10 months ago
  13. KL-RC
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    First of all thanks A LOT for posting this question Sam and No wonder, I was thinking that why is he writing a product of esterification?? instead of a sodium salt?? either way thanks you all! ;D

    • 3 days ago
  14. KL-RC
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    and @emcrazy14 you too!! thanks!!! :D

    • 3 days ago
  15. emcrazy14
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    :)

    • 2 days ago
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