Biology Osmosis Experiment
Osmosis Experiment
Diana Arrowood
Grand Canyon University
BIO-100L Biology Concepts
September 16, 2011
Osmosis Experiment
Directions
Use the information below to complete the Osmosis Experiment.
Materials
1 fresh baking potato
Water
Salt
Four small containers (i.e., drinking cups or clear glasses)
A metric ruler
Methods and Procedure 1) Place 1 cup (236 ml) of water in each of the 4 containers.
In 2 of the containers, add 1 tablespoon (14.8 ml) of table salt and mix well until dissolved. Label which containers have salt.
Cut a fresh baking potato into 5 mm slices. Cut four rectangles 2.5 cm x 1 cm from the slices as close to the same size as possible. Measure the length and width of each rectangle in metric units and place one in each of the containers, keeping track of which measured slice went in which container. There will be two slices (duplicates) for fresh water and two for salt water.
After 1 hour, remove and measure the length and width of each piece of potato and return it to the appropriate container. Note any physical changes.
After 24 hours, remove and measure the length and width of each piece of potato. Note any physical changes in the potatoes and describe their appearance.
Written Lab Report
Introduction
1) Address the following questions: A) Define osmosis. Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides.[1][2][3] It may also be used to describe a physical process in which any solvent moves, without input of energy,[4] across a semi permeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations.[5] Although osmosis does not create energy, it does release kinetic energy [6] and can be made to do work, [7] but is a passive process, like diffusion. (en.wikipedia) (2011-09-16)
Osmosis is the passage of water
Diana Arrowood
Grand Canyon University
BIO-100L Biology Concepts
September 16, 2011
Osmosis Experiment
Directions
Use the information below to complete the Osmosis Experiment.
Materials
1 fresh baking potato
Water
Salt
Four small containers (i.e., drinking cups or clear glasses)
A metric ruler
Methods and Procedure 1) Place 1 cup (236 ml) of water in each of the 4 containers.
In 2 of the containers, add 1 tablespoon (14.8 ml) of table salt and mix well until dissolved. Label which containers have salt.
Cut a fresh baking potato into 5 mm slices. Cut four rectangles 2.5 cm x 1 cm from the slices as close to the same size as possible. Measure the length and width of each rectangle in metric units and place one in each of the containers, keeping track of which measured slice went in which container. There will be two slices (duplicates) for fresh water and two for salt water.
After 1 hour, remove and measure the length and width of each piece of potato and return it to the appropriate container. Note any physical changes.
After 24 hours, remove and measure the length and width of each piece of potato. Note any physical changes in the potatoes and describe their appearance.
Written Lab Report
Introduction
1) Address the following questions: A) Define osmosis. Osmosis is the movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration, aiming to equalize the solute concentrations on the two sides.[1][2][3] It may also be used to describe a physical process in which any solvent moves, without input of energy,[4] across a semi permeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations.[5] Although osmosis does not create energy, it does release kinetic energy [6] and can be made to do work, [7] but is a passive process, like diffusion. (en.wikipedia) (2011-09-16)
Osmosis is the passage of water
References: en.wikipedia.org/wiki/Angiotensin_II#Angiotensin_II Retrieved September 18, 2011 from http://en.wikipedia.org/wiki/Angiotensin_II#Angiotensin_II en.wikipedia.org/wiki/Human_homeostasis Retrieved September 16, 2011 from http://en.wikipedia.org/wiki/Human_homeostasis * en.wikipedia.org/wiki/Osmosis#Basic_Retrieved September 16, 2011 from * * faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Laboratory/Cells/cells.htm#Potato Retrieved September 16, 2011 from * * purchon.com/biology/osmosis.htm Retrieved September 16, 2011 from *