Gluclose effects on osmosis Essay

This essay has a total of 874 words and 6 pages.

Gluclose effects on osmosis



Studying the Effect of Various Glucose Concentrations on Osmosis in a Potato


Osmosis is the process in which water particles move from an area of high water
concentration to an area of low water concentration through a semi-permeable membrane
until the concentrations are equal.


Osmosis has the same basic theory as diffusion. Particles are moving from an area where
they are in great concentration to an area where they are in low concentration until the
concentrations are the same. Osmosis is this movement of water particles and the particles
must move through a semi or partially permeable membrane (a membrane that lets some things
through but not others). An example of this type of membrane is a cell wall, like in a
potato. Osmosis occurs when two things occur. One is if the cell has no water in it or has
less water then the solution it is placed in. If this is the case then water will go from
the solution, for it is the area of high water concentration, into the cell, for this is
the area of low water concentration. If the cell has no water within it the cell is
flaccid. As the water passes through the cell membrane, the cell fills with water and
becomes turgid. Once the cell becomes turgid, no more water can enter the cell and osmosis
stops.


The other incident that can happen for osmosis to occur, is when the concentration of
sugars or other minerals in the cell is different then that of the solution it is placed
in. This is because the amount of sugar in the water either in the cell or in the solution
is going to change the water concentrations as well. Whichever solution, either in the
cell or not, contains a higher sugar concentration will have a lower water concentration.
If the solution in the cell contains more sugar, salt or other minerals then the solution
it is placed in, then it will have a lower water concentration. This will cause water from
the external solution to pass through the cellís semi-permeable membrane into the cell to
make the two concentrations equal. Osmosis would also occur if the external solution
contained more sugar then the solution inside the cell. In this case, water from inside
the cell would pass through the cellís semi-permeable membrane into the external solution
making the concentrations equal.


If we relate osmosis to the weight of our potato, we can see that if the potato cells lose
water the weight of our potato decreases and if the potato cells gain water then the
weight of our potato increases. We can determine the concentration of our potato by
knowing this. If the potato increases in weight, then the solution outside the cell has a
greater water concentration then that which is inside the cell. We know this because water
must have entered the cell through its membrane because the water was moving from an area
of high water concentration (the external solution) to an area of low water concentration
(inside the cell) until the concentrations were equal. If the potato decreases in weight,
then the solution inside the cell has a greater water concentration then that which is
outside the cell. We know this because the water must have left the cell through its
membrane because the water was moving from an area of high water concentration (the inside
of the cell) to an area of low water concentration (the external solution) until the
concentrations were equal.


Diagram of Apparatus


Apparatus
Potato
Glucose Solution
Boiling Tubes and Rack
Scale




Continues for 3 more pages >>