Membranes : Experiment on Osmosis (hypertonic isotonic hypotonic) (using blood cell and different five bags of dialysis water tu - Research Paper Example

Download file to see previous pages The substance that can dissolve in water is known as a solute. Water can freely move across selectively permeable membrane but some solutes cannot. When the concentration of solute is different on both sides of the cell, a concentration gradient is created. If solutes are not able to pass through the cell, then water will move across the semi-membrane by osmosis to achieve equilibrium. The terms used to describe two solutions, which are separated by a membrane that is selectively impermeable are known as hypertonic, hypotonic, and isotonic. A hypotonic is a solution containing a lower concentration of solute than that found in the cell or opposing solution. A hypertonic is a solution containing a higher concentration of solute than that found in the cell or opposing solution. An isotonic solution is a solution with equal concentration of solutes in the solution and cell. If a cell is placed in a hypotonic solution; water will move into the cell from the opposing solution by osmosis and the cell will swell. The cell will eventually burst in case of red blood cell in a process called haemolysis. If a cell is placed in a hypertonic solution, water will move out of the cell to the opposing solution. The cell will reduce in volume. The cell will eventually shrink in case of red blood cell in a process crenation. ...
It excludes large substances since they cannot pass through the small pores of the membrane. Thus, dialysis membrane is selectively permeable membrane and acts in this experiment as a cell. What is the effect of a changing sucrose concentration and water on a dialysis membrane? In the experiment, 5-dialysis tubing were each tied off at the bottom and later filled with sucrose solution. Each bag was also labeled so as not to confuse them. The bags were weighed and the weight recorded. After that, all the bags were placed in their respected solutions, the weight changes were then recorded in ten-minute intervals from the start time and at the end of the experiment. The aim of this experiment is to see the effects of osmosis through a permeable membrane that is selective using sucrose solution. This experiment is a replica of how osmosis takes place. The dialysis tubing serves as a permeable membrane, which osmosis will occur. Since cells are so small, this experiment serves as a replica in which osmosis is observed and recorded. It is expected that increasing the sucrose concentration and its percentage will increase the rate at which osmosis occurs in the experiment on the dialysis tubing. This will suggest that the more the concentrated sucrose solutions will be, the greater the rate of osmosis occurs and the lesser the sucrose concentration, the slower the rate of osmosis in the experiment. Materials Sucrose Solution, Dialysis Tubing, Syracuse dish filled with water, a String, five 500 ml Beakers, graduated cylinder Procedure 1. Take 5 bags of dialysis Tubing and soak them in Syracuse dish filled with water for 5 minutes. It is crucial to soak the dialysis tubing in water for the tubing ...Download file to see next pagesRead More