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Benedict's test

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Benedict's test Method 1. First of all, weight the mass of each specimen (Banana, Carrot, Digestive Biscuits, Apple, Cheddar Biscuits, Marshmallow, Raisins, Coconuts and Bread). Record. 2. Boil about 250ml water for the water bath. 3. Put the specimen into the tubes individually. And add 4ml of Benedict solution in each tube. Record the initial colour of benedict solution. 4. Put the tubes into the water bath. You can every time put three tubes in a water bath. Time one and a half minutes by using a stopwatch. 5. After one and half minutes. Get the tubes out from the water bath and observe the colour changed accurately. ...read more.


Conclusion Food Mass of food (g) Volume of Benedict solution (ml) Colour changed after boil for 1.30mins Banana 0.98 4 Red Carrot 0.77 4 Orange Digestive Biscuits 0.40 4 Bluish green Apple 0.64 4 Orange Cheddar Biscuits 0.27 4 Green Marshmallow 0.37 4 Red Raisins 0.53 4 Red Coconut 0.38 4 Blue Bread 0.44 4 Orange According to my results, banana, marshmallow and raisins have more reducing sugar. Carrot, apple and bread have less reducing sugar. There have no reducing sugar in coconut and digestive biscuits. The table shows that the colour indicates the concentration of sugar in the food. The colour of solution turns through from blue, green, to orange and red, from the lower concentration to higher concentration. ...read more.


Besides, as we use the stopwatch, we used to have a reaction time and we have a different reaction time every time when we are using the stopwatch. So it might be affect our results. Evaluation The colour of the result sometimes become too hard to decide what colour it is and there are some methods that can be used to help solving this problem. By using glucose in different concentration, and adding Benedict's solution to it, this will produce different colour. Through different concentration the colour will change from blue, green, orange and red. Therefore we can use the colour produced by different concentration to identify the colour and which colour of concentration it is more close to. The other way is using a light detector and shines a beam through the solution to identify the colour. ...read more.

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