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Exploring Osmosis and Diffusion: The Role of Iodine as a Starch Indicator

In this summative lab, we explore the principles of osmosis and diffusion through the use of iodine as an indicator for starch. Iodine, a small molecule with a molecular mass of 380.7 Da, exhibits a striking color change from reddish-brown to deep purple in the presence of starch, a large molecule composed of glucose subunits. By modeling a semi-permeable cell membrane with dialysis tubing, we will investigate how molecular size affects the ability to pass through the membrane. Essential for understanding key concepts in cell biology and membrane dynamics.

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Exploring Osmosis and Diffusion: The Role of Iodine as a Starch Indicator

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  1. Osmosis and Diffusion Summative Lab

  2. Key Facts Iodine is an indicator for starch. Normally, iodine is a reddish-brown color, but in the presence of starch, it changes to a deep purple color. Iodine is a small molecule. Its molecular mass is 380.7 Da.

  3. Key Facts Starch is a large molecule. It is made of hundreds of glucose molecules, each weighing more than 180 Da. Dialysis tubing will only allow molecules smaller than 14, 000 Da to pass through its membrane.

  4. Goal Model a semi-permeable cell membrane, and observe how the size of a molecule affects the ability of a molecule to pass the membrane.

  5. Key vocabulary Semi-permeable Osmosis Diffusion concentration

  6. Set Up

  7. Data Table

  8. What is due…… • Full lab report • No variables needed • No graph needed • Title • Testable Question • Hypothesis • Materials 20% grade • Data • Full Conclusion - 80% grade

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