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To see how solubility of sugar dissolved in water is affected by temperature

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Coursework Poonam Paw-10E Dissolving Sugar Title of Investigation - Dissolving Sugar Aim - To see how solubility of sugar dissolved in water is affected by temperature The variables (excluding key variables) must all be kept the same at all times. This is to ensure that we are doing a fair test. Variables - Time to dissolve (seconds) Temperature ( C) How much the solution is stirred (20 times, 25 times e.t.c) How the solution is stirred (circular motion, side to side) The amount of sugar added (grammes) The surface area of the sugar (cm) The shape of the beaker (wide at top, long and thin) The type of sugar (Demara, granulated e.t.c) The type of water (hot, cold e.t.c) Key Variables - The temperature of the water ( C) Adding the same type of sugar, but changing the limit (Grammes) Scientific Theory - Sugars belong to the carbohydrate family. They come in two forms, cubes and crystals. Their compounds consist of three elements. These are Carbon, Hydrogen and Oxygen. There are many different types of sugar, i.e - icing sugar, dermara sugar, granulated sugar and brown sugar. Many of our foods also contain sugar in them. ...read more.


Preliminary work - I did a preliminary test to see what the best way would be to stir the solution once the sugar had been added. I firstly filled a beaker with cold water, and then added a spoon of caster sugar in it. I stirred the solution in a circular motion, and soon figured that the sugar was not dissolving easily, and seemed to be positioning itself at the centre of the water. I then stirred the water from side to side, and soon figured that this was the best way to stir the solution. The water was more turbulent, and was beginning to dissolve the sugar. Plan - The equipment I will use is -: A Beaker A Bunsen burner A Tripod A Thermometer A Stirrer I will also need -: Granulated Sugar/Sucrose Water I will set up all my equipment and place cold water into the beaker. I shall record the weight of my beaker with the water, will then place a thermometer in it. After heating the water with a Bunsen burner, I will record my result every 10 C starting at 20 C. I will continuously add sugar, half a teaspoon at a time, until the sugar no longer dissolves, and seems to be reaching its saturation point. ...read more.


Therefore they attracted to the negative nuclei which caused them to collide harder, allowing them to break. Evaluation - I think that the evidence that I have collected is extremely sufficient and accurate to draw a firm conclusion. I only had one set of anomalous results. This occurred when the temperature of my water was 20 C. At this temperature 2.5g of sugar dissolved two out of three times. Although I had these anomalous results, I feel that my results were very sufficient and allowed me to draw a firm conclusion. Considering the fact tht I had a lack of professional, more reliable resources I made effective use of the apparatus I had in order and performed my experiment in the best possible way that I could. The main point was that I achieved my aims, I was very fair, and I had accurate and results. If I were to redo this experiment, and make it more accurate and reliable, I would use a mechanical stirrer to ensure that each experiment was stirred at the same rate. I would also use a water bath, to keep the temperature constant. Finally I would do each experiment 5 times instead of 3. This would enable a consistent and fair set of results. If I were to extend the investigation, I would try using different types of liquids other than water. For example salt water. ...read more.

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