Dialysis of Starch

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Dialysis of starch, glucose and sucrose Introduction: Research question: Does the dialysis tube only allow certain substances to pass through the pores because of their size? Dependent and Independent variables: Independent variables: The temperature of the classroom The size of the molecules The size of the pores in the tube The concentration of the indicators Dependent variables: The substance will either pass the pores of the tube or not The result will vary in darkness (color) Controlled variables: The heat of the Bunsen burner The time taken to heat the substance The quantity of the liquid Hypothesis: Through help of the indicators we can find out if sugar can pass through the dialysis tube. Sucrose may not pass because it consists of two glucose molecules. Starch is a big molecule so it might not pass as well. Materials: Dialysis tube Test tube Bunsen burner Platform to put on the beaker Method: Put glucose in dialysis tube Leave the substance in a beaker for 15 minutes to give it the time to diffuse Take around 1 or 2 ml of the water + Benedict out and put it into a test tube Allow it to heat for 1 minute and see if there is any reaction. Put sucrose in dialysis tube Leave the substance in a beaker for 15 minutes to give it the time to diffuse Add hydrochloric acid to the water and afterwards Benedict Take around 1 or 2 ml of the water and put it into a test tube 10.Allow it to heat for 1 minute and see if there is any reaction in tube 11.Put starch in dialysis tube 12.Leave the substance in a beaker for 15 minutes to give it the time to diffuse 13.Add 2ml iodine to it and check if it has the same reaction as the lab report before 14.If there is time left, do control experiment to see if there is no reaction without the experimental substances (sucrose, glucose and starch) 15.If time left do negative control experiment to see...
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