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The refactive index concentration of soluble substances

            
             To find a connection between the refractive index and the concentration of a solute in a solvent.
            
             We understand that there are many variables in this experiment that we will attempt to control. Things like Temperature, the concentration of the solute, the amount of water, thickness of the plastic container, the angle of the incident ray and the accuracy of our measurements will all need to be managed. The only variable that we will be consciously altering is the concentration/amount of the solute.
             The Hypothesis:.
             That as the concentration increases the refractive index will increase.
             .
             The Equipment:.
             Beaker Stirring Rod.
             Water Sugar.
             Measuring Cylinder 3 semi circular trays.
             Pencil Large protractor.
             Light Box .
             We chose water as our solvent as it was cheap, readily accessible and we had the advantage of already knowing its refractive index (1.33). We chose sugar for the solute as it was also chap and accessible and we knew it would dissolve fairly easily into the water. We needed the beaker and stirring to mix the sugar and water well. We predicted that if we attempted to combine them in the trays it would get messy and the sugar might not be fully dissolved. The measuring cylinder would give us a consistent and accurate way of measuring the amounts. The three semi-circular trays provided a good way to hold our solution. It also mad measuring angles as the rays didn't refract when leaving the tray. We chose a light box to generate our ray of light as we already were competent with its use and it provided an adequate accuracy. We also believed it to be a safer option. (Richard was lying by the way) The large protractor gave us a more accurate way of measuring the angles of both the incident and the refracted rays. .
             The Method: .
             1) Sketch four trays onto paper and measure an angle of incidence of 30 and 50 for each. .
             2) Measure 80mls of water and combine with 20mls of sugar in beaker stir with stirring rod until sugar is dissolved.


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