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# Problem solving investigation on Food Tests

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Introduction

ï»¿Problem Solving Investigation Food Tests By: Lara Camilleri 4.7 Problem Powdered Food Import Co. is a local importer of powdered food for farm-animals. They import a number of ready-mixed feeds which are prepared with the right proportion of nutrients for different animals. The different powdered foods are sent in coloured containers, since all the mixed powders are white-coloured. Ä anni Depasquale is the new store-keeper for the company, brought in to replace the previous one who was fired because he was careless at his job. Ä anni has been told to sort out the containers, but he cannot find the colour-code key which tells him what each coloured container contains. He needs to sort out the containers as quickly as possible in order to transfer the containers to the top floor for labelling, and would like to avoid delays which might “endanger” his job. He discovers that there are 4 different containers, coloured Orange, Green, Blue and Red. Solving his problem The problem the store-keeper is encountering is that he is unable to determain what nutrients are present in each container. To help him solve the problem we are going to carry out various food tests, in order to find out the components of each container. ...read more.

Middle

Testing for Vitamin C: - A tablespoon of cornflower will be mixed with enought water to make a paste. - 200 milliliters of water will be added to the paste and boiled for 5 minutes. - 6 drops of starch solution will be added to 75 milliliters of water. - Enough iodine will be added to produce a dark purple-blue color. (Indicator) - 6 drops of indicator of solution will be placed in a test tube, were added to the cornflower. - The test tubes from all the powders will be placed against a white background. Step 5: Colour changes will be noted. Step 6: Results will be presented in table form. The table will look like this: Testing For: A B C D Reduced Sugars Starch Proteins Lipids Vitamin C Chloride Predictions: If the food is rich in the nutrient, these colours should be noted: Reduced Sugars Green ? Yellow ? Orange-red colour Starch Brown Proteins Blue-Purple Lipids White emulsion Vitamin C Light White Chloride White emulsion Method Step 1: 15cm3 of water will be added to 10g of each powder. In total there are 4 powders. ...read more.

Conclusion

Still, we could have concluded if the powder was rich in a certain nutrient judging of how much the colour obtained resembled the expected colour i.e. if we were expecting red, and it resulted yellow, it meant that it had a little bit of that nutrient but only traces. Overall our method was pretty good. However if I was to conduct the experiment again I would vary it a little bit. For instance, the experiment would have been better if we had more of the powder. Also while pouring from a beaker to a test tube, some of the substance may have remained in the beaker, so the volumes may have not been as accurate. Another source of error was the number of drops of the reagent used. We used 8 drops for every experiment. However, if in some cases we had added, say 2 more drops, the result could have changed from negative to positive. As discussed previously, if we had more time, we may have conducted another experiment, that the powder may have been rich in. For instance, I did find a method for tesing potassium but it needed a vacuum and several other chemicals which were not available in the laboratory. However our overall result was pretty good, and I believe that we did solve Mr.Depasquale?s problem. ________________ | Page ...read more.

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