OSMOSIS & DIFFUSION LAB

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Presentation transcript:

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

Sit in groups of 2 or 3 Don’t touch the lab supplies on your table until you receive directions.

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

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

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

STATION #1 Write your names on the cup Fill cup with 2/3 full http://www.chemistryland.com/CHM107Lab/Lab5/Soil/Lab5Exp3Soil.html Write your names on the cup Fill cup with 2/3 full with water 3. Your teacher tested the water for the presence of glucose. Make sure you marked the results on your lab sheet 4. Go to Station #2

STATION #2 Add 5 droppers (NOT DROPS!) of IODINE to water in your cup. Image by Riedell Add 5 droppers (NOT DROPS!) 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 USE A TOWEL TO DRY OFF YOUR MEMBRANE BAG WITH Image by Riedell USE A TOWEL TO DRY OFF YOUR MEMBRANE BAG WITH Measure with your finger to see how full your membrane bag is. 3. Take bag & cup back to your table. 4. START EXPERIMENT by placing the membrane bag in the cup. 5. WAIT AND WATCH WHAT HAPPENS!