Isotonic Solution - both solutions have same concentrations of solute.
Plant and Animal Cells put into
We are using dialysis tubing as the cell membrane - It is selectively permeable
The solute is either the eosin starch solution or the sugar solution
What is the solvent?
Solute is eosin-starch-chloride solution
Solvent is Water
Indicator for presence of starch is IKI
Starch is made of amylose and amylopectin – amylopectin is insoluble
Iodine is not very soluble in water, but with KI it forms a I3- (triiodine ion) which is soluble.
I3- combines with the amylose and the starch molecule turns blue-black.
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Indicator for presence of chloride ions is silver nitrate, AgNO3
A white precipitate, AgCl, forms if chloride is present.
Indicator for the presence of sulfate ions is Barium chloride, BaCl
Barium sulfate, BaSO4 - forms a white precipitate
BaCl + NaSO4 ----> BaSO4 + NaCl
Beet cubes will be used to see the result of boiling and adding alcohol to a live membrane.
Yeast cells are used to see effects of heat
Fern gametophytes are used to see result of putting live cells in solutions of varying tonicity
We will make an osmometer to see osmosis
Sugar solution in a dialysis tube is used to simulate a cell membrane.
Various concentrations of solute may be used around the room.