OSMOSIS & DIFFUSION LAB

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Presentation transcript:

OSMOSIS & DIFFUSION LAB Animation from: http://www.lionden.com/cell_animations.htm

SAFETY DO NOT EAT OR DRINK ANYTHING IN LAB! IODINE IS POISONOUS WEAR AN APRON! IODINE WILL STAIN YOUR SKIN AND CLOTHING Image from: http://www.llnsciencepark.be/en2/images/caution.jpg

DIP TEST FOR GLUCOSE If glucose is present strip will turn from AQUA BLUE to YUCKY GREENISH BROWN Image modified from: http://www.freepatentsonline.com/6531322.html

IODINE TEST for STARCH Iodine turns BLUE-BLACK in the presence of starch. http://faculty.ntcc.edu/mhearron/cell_chemistry.htm

STATION #1 Use marker to write your names on cup http://www.chemistryland.com/CHM107Lab/Lab5/Soil/Lab5Exp3Soil.html Use marker to write your names on cup Fill cup with 2/3 full with water 3. Teacher will have tested the water for GLUCOSE. Make sure you filled in your data sheet with results. 4. Go to Station #2

STATION #2 Add 3 droppers of IODINE to water in your cup. Be careful! Image by Riedell Add 3 droppers of IODINE to water in your cup. Be careful! IODINE IS POISONOUS! It will stain your clothes! It will stain your skin! 2. Use a permanent marker to label the level of liquid in the cup. 3. Go to Station #3.

STATION #3 1. Hold membrane bag UNDER RUNNING WATER and rub it http://www.beartoes.com/images/sink.jpg 1. Hold membrane bag UNDER RUNNING WATER and rub it with your fingers until it opens. 2. Run water THROUGH the INSIDE of the bag. 3. Tie a KNOT at ONE end of the bag. 4. Go to Station #4.

STATION #4 1. Make sure you have tied a knot in ONE end of the Image by Riedell 1. Make sure you have tied a knot in ONE end of the membrane bag. 2. Fill bag with GLUCOSE (use 2 fingers to determine how much to fill it) 3. Pinch end closed to keep from spilling 4. Go to Station #5.

STATION #5 1. Add STARCH to the membrane bag on top of the glucose Images by Riedell 1. Add STARCH to the membrane bag on top of the glucose (use 2 fingers to determine how much to fill it) 2. Leave a little space at the end and tie a KNOT to seal the bag. 3. Go to Station #6.

STATION #6 Take your MEMBRANE BAG to the SINK and RINSE IT ………really, really, really, really, really, really, really, really, (I mean it!) REALLLLLLLLY WELL. Go to Station #7.

STATION #7 Image by Riedell Use balance to determine the mass of your dialysis bag. Be sure to record this in your lab packet. 2. Take cup back to your table. 3. START EXPERIMENT by placing the membrane bag in the cup. 4. WAIT AND WATCH WHAT HAPPENS!