reverse osmosis melbourne Determination of turgor pressure and study of the process of osmosis-Ocpur

reverse osmosis melbourne Determination of turgor pressure and study of the process of osmosis

by:Ocpuritech     2019-07-18
During the infiltration process, the solvent moves from the area with lower salt concentration through the semi-solvent to the solution with higher concentrationPermeable membrane.--xa0The infiltration process observed in plant tissue is important for botanists.When placed in a solution with a higher concentration, the expanded potato becomes soft and the size is reduced.
The swelling pressure is the pressure exerted by the cell contents on the cell wall.Expansion pressure is important for plant support and shape retention.If the solution is highly seeping, the cells will die of slurry due to lack of water.
Plant cells do not have enough swelling pressure to prevent wilting and may lead to death in an isoseted solution.The information obtained about the expansion pressure is important to understand the effects of different solutions on organisms in our environment, including ourselves.The ideal solution for plant cells is a low sheet solution, because the absorption of water by cells increases the swelling pressure.
Grade K studentsUnderstand the process of infiltration and reverse osmosis.Expansion pressure and penetration are mutual.related.In a low-sheet solution, infiltration occurs when water flows into plant cells from a lower concentration.
As a result, the factory became swollen.
A certain amount of pressure is applied to swollen plant cells, called expansion pressure.The use of potato core can achieve quantitative and qualitative study of penetration and expansion pressure.This study helps students predict the behavior of plant cells at different solution concentrations.
When placed in pure water, the weight of the potato core changes.Because potatoes contain sugar in the form of carbohydrates and some salt, they are highly concentrated.If plant cells are placed in pure water (low sheet solution), water will initially enter the cells.
These cells become swollen after a period of time.At first, most of the water entered the cells.As the pressure of expansion increases, water will begin to spread from the cells at a higher rate, eventually reaching a balance, and water will enter and leave the cells at the same time.
Water always moves from high to low.
Water potential is a tendency to measure the movement of water from high free energy to low free energy.The hydropower potential of distilled water in the open beaker is 0 (zero ).With some solvent added, the water potential decreased.
In cells, water moves through infiltration to areas with lower potential.The high permeability solution has a lower water level rate.In a highly permeable solution, the cell loses water due to the penetration of water from the cell into the solution (exo-osmosis).
This caused the potato to become lame and reduce the volume.The higher the concentration of the solution particles, the more water the potato cells lose, so as the concentration of the solution increases, the more weight loss.This study can be carried out in the laboratory and in the presence of different concentrations of sucrose and common salt, the potential of the potato core can be determined.
Of course, potatoes contain two substances, some sucrose and salt.Therefore, at higher concentrations of potato salt and sugar, the core increases weight.However, when the environmental concentration of salt and sugar increases, the potato core begins to lose weight as the solvent shifts from the core to the outside.
This weight loss can be quantitatively expressed in the form of water and solution pressure.Water potential is a tendency to measure the movement of water from high free energy to low free energy.According to the convention, the potential of pure water is defined as zero (= 0) under atmospheric pressure ).
For example, a 0 can be calculated.
= 0) has-2.
Since dissolved () =-2.
= -I = ionization constant (this is 1 for sucrose.R = pressure constant (R = 0.= 0) allows you to calculate the potential of the solution.The water potential will be equal to the dissolution potential of the solution.
The potential of the solution at equilibrium will be equal to the potential of potato cells.The water potential value is useful because it enables us to predict the direction of the flow of water.Water always flows from areas with higher potential water levels to areas with lower potential water levels.
The expansion pressure is a co-lattice property that is proportional to the amount of the solvent and inversely proportional to the molar mass of the solvent.The Vanhoff t Hoff factor is defined as the observed molar mass/calculated molar mass.When a solvent has neither binding nor dissociation, the v _ t Hoff factor is equal to 1.
But there is a dissolution like sodium chloride that disconnects I> 1.The expansion pressure of the potato core determined by the experiment is different from the calculated expansion pressure, which is called abnormal expansion pressure or abnormal aggregation characteristic.For a student, this program helps to understand the swelling pressure, penetration, composite properties and the van Thant Hoff factor.
Charts drawn from the data help students determine the potential water level graphically and compare it to the calculated results.This experiment is simple, but the information obtained is a useful and important study
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