Friday- 2/3/12
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Transcript of Friday- 2/3/12
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Friday- 2/3/12
Homework: Short checkup on Monday on water movement and concentration.
Do you owe me logbook $$$??
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Solute= stuff dissolved in a solution ex: sugar, salt
Solvent= liquid doing dissolving in a solutionex: water
Solute Solvent
Which side has a higher solute concentration?
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In your own words:• What does concentration mean? (in
terms of solutions) The amount of Solute in a solution.
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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.
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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.
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Entry 2 :WATER ACROSS A MEMBRANE LAB2/3/12
• ON BACK OF EGG DEMO SHEET (write that under the title )
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Design a controlled experiment…
…to investigate how a concentrated solution on one side of a membrane affects the movement of water through the membrane.
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• Question: How does concentrated solution on one side of a membrane affect the movement of water?
• Hypothesis: (this should answer the question above) Water moves toward higher solute concentration.
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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
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SUGAR WATER
WATER
WATER
SUGAR WATER
EXPERIMENTAL CONDITIONS
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SUGAR WATER
SUGAR WATER
WATER
WATER
What would be the CONTROL setup?
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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”
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Procedure:
1) Tie one end of tubing.2) Place water/sugar water into dialysis tubing.3) Tie other end of tubing then rinse off bag.4) Measure the mass of the dialysis tubing.5) Place into beaker of water/sugar water. 6) Write mass on label and tape on beaker.
Take the mass of tubingThen put into beaker
Tie one end of tubing with string
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BEFORE AFTER DIFF.
SUGAR INSIDE/WATER OUTBEFORE AFTER DIFF.
WATER INSIDE/SUGAR OUT
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Procedure:
1) Tie one end of tubing.2) Place water/sugar water into dialysis tubing.3) Tie other end of tubing then rinse off bag.4) Measure the mass of the dialysis tubing.5) Place into beaker of water/sugar water. 6) Write mass on label and tape on beaker.
Take the mass of tubingThen put into beaker
Tie one end of tubing with string