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Friday- 2/3/12

Friday- 2/3/12. Homework: Short checkup on Monday on water movement and concentration. Do you owe me logbook $$$??. Solute= stuff dissolved in a solution ex: sugar, salt. Solvent= liquid doing dissolving in a solution ex: water. Solute. Solvent.

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Friday- 2/3/12

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  1. Friday- 2/3/12 Homework: Short checkup on Monday on water movement and concentration. Do you owe me logbook $$$??

  2. Solute= stuff dissolved in a solution ex: sugar, salt Solvent= liquid doing dissolving in a solution ex: water Solute Solvent Which side has a higher solute concentration?

  3. In your own words: • What does concentration mean? (in terms of solutions) The amount of Solute in a solution.

  4. 10 ml of water compared to 1 liter of the same water – which is more concentrated? They have the same concentration. We are not comparing the amount of solute.

  5. Which is more concentrated? 10g of salt in a liter of water compared to 100g of salt in a liter of water. 100g of salt is more concentrated because it has more solute.

  6. Entry 2 :WATER ACROSS A MEMBRANE LAB2/3/12 • ON BACK OF EGG DEMO SHEET (write that under the title )

  7. Design a controlled experiment… …to investigate how a concentratedsolution on one side of a membrane affects the movement of water through the membrane.

  8. Question: How does concentrated solution on one side of a membrane affect the movement of water? Hypothesis: (this should answer the question above) Watermoves towardhigher solute concentration.

  9. We will perform an experiment that would have a concentration difference between two sides of a membrane. MATERIALS: Dialysis tubing (for a model of a cell), Beakers, Sugar solution (sugar and water), Water, String, Pipette, Labels, Scale

  10. EXPERIMENTAL CONDITIONS WATER SUGAR WATER WATER SUGAR WATER

  11. What would be the CONTROL setup? SUGAR WATER WATER SUGAR WATER WATER

  12. PREDICTION:(How will you know your hypothesis is true?) • “IF MY HYPOTHESIS IS SUPPORTED, THE TUBE CONTAINING SUGAR WATER WILL GAIN MASS WHEN PLACED IN PURE WATER”

  13. Take the mass of tubing Then put into beaker Tie one end of tubing with string Procedure: • Tie one end of tubing. • Place water/sugar water into dialysis tubing. • Tie other end of tubing then rinse off bag. • Measure the mass of the dialysis tubing. • Place into beaker of water/sugar water. • Write mass on label and tape on beaker.

  14. SUGAR INSIDE/WATER OUT WATER INSIDE/SUGAR OUT

  15. Take the mass of tubing Then put into beaker Tie one end of tubing with string Procedure: • Tie one end of tubing. • Place water/sugar water into dialysis tubing. • Tie other end of tubing then rinse off bag. • Measure the mass of the dialysis tubing. • Place into beaker of water/sugar water. • Write mass on label and tape on beaker.

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