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Reducing and non-reducing sugars tests.

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  • Essay length: 649 words
  • Submitted: 16/11/2004
  • Marked by teacher: (?) Adam Roberts
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Teacher essay summary

3 star(s)

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The author has a sound understanding of the biochemistry behind this straightforward experiment. However, muddling up the tests for reducing and non-reducing sugars suggests that the finished write up was not checked. Greater attention to detail generally would have improved the quality.

Marked by teacher Adam Roberts 05/09/2013

The first 200 words of this essay...

REDUCING and NON-REDUCING sugars tests.

Aim:

To distinguish which of the four unknown given substances are sucrose, maltose, glucose and water.

Apparatus:

Safety:

For this experiment I made sure all the glassware was away from the edge of the table to avoid knocking them off and smashing them. Also I was careful whilst boiling the solutions and I was careful carrying to and from the water bath. I wore safety goggles throughout the experiment.

Method:

NON-REDUCING sugar.

* Add 2cm of one of the unknown solutions into a test tube

* Add 2cm of benedict's solution

* Repeat this with each of the unknown solutions

* Heat all the solutions in the water bath for 2 minutes

Look at the colour of the solution if it remains the original blue colour of the benedict's solution then proceed with the test for REDUCING sugars.

REDUCING sugar

* Using new samples of the solutions, add 2cm of dilute hydrochloric acid

* Boil the test tubes over a Bunsen burner passing it through a blue flame so it doesn't reach boiling point to rapidly

*

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MbT essay summary

***
The author has a sound understanding of the biochemistry behind this straightforward experiment. However, muddling up the tests for reducing and non-reducing sugars suggests that the finished write up was not checked. Greater attention to detail generally would have improved the quality.

Marked by teacher Adam Roberts 05/09/2013

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