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Principles behind osmosis and diffusion
Introduction to osmosis
Principles behind osmosis and diffusion
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The Effect of Changing the Concentration of Sucrose on the Movement of Water into a Potato
Introduction
Aim
1. To use different concentrations of sucrose solution to determine
the internal concentration of the potato.
2. To use different concentrations of a solution more dilute than the
internal concentration of the potato to find out what the effects of
different sugar concentrations have on the movement of water into the
potato.
Theory
======
Osmosis is the movement of water from a dilute solution to a more
concentrated solution, through a partially permeable membrane, until
the concentrations are equal. Linking this to my aim, we need to find
out the internal concentration of the potato so that we will know
which concentration of sucrose solution will make water move into the
potato, though Osmosis. Once we have done this, it is possible to
increase the dilution to find out the effects that different sucrose
concentration have on the movement of water into the potato.
Prediction
==========
1. If the internal concentration of the potato is the same as the
concentration of the solution, then osmosis will not happen and the
weight will remain unchanged.
2. The more dilute the solution, the greater the movement of water due
to osmosis and therefore the greater the change in weight.
Fair testing
============
Firstly, we are using six discs in each measuring beaker. This is to
make sure that when cutting up the potato cylinder into 0.5cm discs we
know that the surface area of 1 potato disc will measure out the
surface area of another.
Then, we are going to leave them for 24 hours. This is to make sure
that all the Osmosis that is going to happen will happen. Also they
will be kept in the same place so that the temperature will always be
the same at every point of the 24 hours.
Thirdly, we are going to cover them with cling film so that the water
If we say that the right hand side in picture 1 is the potato, and the
Investigation of the Concentration and the Effect of Sucrose on Osmosis in Apple and Potato Tissues
Conclusion In my conclusion, the potatoes with the lowest concentration gained the most mass, and would become hard relating back to the Turgor theory I stated earlier. In contrast to this, the potatoes in the most concentrated solution lost the most weight thus becoming plasmolysed and limp also relating back to the background I have mentioned earlier. Evaluation In general the experiment was succesful the results were consistent and also were in accordance with the theories made at the start.. The experiment could have been improved by: · More subjects used instead of potatoes · More potatoes · Wider time ranger · Different molarities Using this variety of methods could have improved the experiemnt, however I was generally satisfied with the results of this osmosis experiement.
Osmosis in Potato Tubes Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration. Diagram: [IMAGE] [IMAGE] Aim: To see the effects of different concentration of sugar solution on Osmosis in potato tubes. Key factor: In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass. Prediction: I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis.
* Note the mass down in the table at the end of the first page.
In recent decades, violent crimes in the United States of America have been on a steady decline, however, the number of people in the United States under some form of correctional control is reaching towering heights and reaching record proportions. In the last thirty years, the incarceration rates in the United States has skyrocketed; the numbers roughly quadrupled from around five hundred thousand to more than 2 million people. (NAACP)In a speech on criminal justice at Columbia University, Hillary Clinton notes that, “It’s a stark fact that the United States has less than five percent of the world’s population, yet we have almost 25 percent of the world’s total prison population. The numbers today are much higher than they were 30, 40
potato chips left in a sugar solution for a period of 1 hour. I will
Investigate the Osmosis of Potato Cells in Various Salt Solutions. Introduction I have been asked to investigate the effect of changing the concentration of a solution on the movement of water into and out of potato cells. I will be able to change the input of my experiment. The input variable is the concentration of the solution.
cork borer and a ruler. I will keep the potato chips the same size in
To investigate the osmotic effect of changing the concentration of sucrose solution; distilled water, 20% sucrose solution, 40% sucrose solution, 60% sucrose solution on the change in mass of potato cylinder after 30 minutes of being in solution.
This is because the water molecules passed from a high concentration in the water, to a low concentration, in the piece of potato. Therefore, the potato in higher water concentrations will have a larger mass than in higher sucrose concentrations. i.e. The potato pieces are shown to have water potential. The attached graph shows the concentration of the sucrose solution plotted against the average mean change in mass.
the same way as it does potato. I would also widen the range of sugar
The Effect of Salt Solution Concentration On The Mass Of Potatoes Introduction = == == == ==
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
there would be no flow of water into or out of the cell so the cell