The movement of water molecules from an area of high concentration to an area of lower concentration is commonly known as osmosis. Osmosis is one of the processes that allow materials to move either in or out of an organism or within it. In order for osmosis to occur, there needs to be a semi permeable membrane for the water molecules to pass through. Semi permeability refers to the ability of a membrane to partially allow water to pass through it. Osmosis depends on energy generated by differences in concentration of substances on both sides of the membrane, which is known as concentration gradient. Along with concentration gradient, factors such as temperature and particle size can affect the rate of osmosis. An experiment will be conducted to see what the effect of concentration gradient has on the rate of osmosis. In this experiment, five bags will be filled to act as “cells”. Cell one will be filled with tap water, cell two with 20% sucrose, cell 3 with 40% sucrose, and cell four with 60% sucrose. Each of these bags will be fully submerged in a beaker of tap water of the same temperature. The relationship between the solute’s concentration outside or inside of the cell is the tonicity of the solution. Cell one is an isotonic solution because the solute is equally concentrated on both sides of the cell, meaning the water moves both ways across the membrane. When the water does not move both ways across the membrane and only moves into the cell that means it is hypotonic because the solute is more concentrated inside the cell. This is the case for cells two, three, and four. Then, a fifth cell is filled to serve as a control. Tap water is placed in the cell and the cell is fully…
Diffusion and Osmosis lab
Abstract: In this experiment, we learnt about Osmosis and Diffusion through potato slices and dialysis tubes in different concentration of sucrose; (Di water, .2, .4, .6, .8, and 1.0). However, our result was quite off in both of out labs but although our graph and our results were off, it still partially backed up our hypothesis.
Introduction: Osmosis is a special kind of diffusion in which water moves through a selectively permeable membrane…
from an area of high concentration to an area of lower concentration. Diffusion moves down the concentration gradient, which is the difference in the concentration of molecules across a space. Osmosis is a type of diffusion in which water molecules move down the concentration gradient.
When the concentration of solute molecules outside the cell is lower than the concentration of solute in the cytosol , the solution outside is hypotonic to the cytosol. If the concentration of solute molecules…
Osmosis is defined as, diffusion, or net movement, of free water
molecules from high to low concentration through a semi-permeable
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
The effect of this, is that the concentration of (free) water
molecules in that environment goes down. There are…
Understand the process of osmosis.
Know the effects of osmosis on plant and
is a special kind of diffusion
involving water molecules only.
A solution such as cytoplasm or tissue
fluid consists of a solvent such as
water and a solute such glucose or
It is the net movement of water across a
partially permeable membrane from an
area of high water concentration to an area
of low water concentration.
solution along a concentration gradient (i.e. from areas of high concentration to a low concentration) until there is an equilibrium.
Osmosis: The diffusion of water molecules through a selectively permeable membrane from a region of low solute concentration to a region of high solute concentration.
• Demonstrate diffusion across a semi-permeable membrane
•Measure the effects of various concentrations of solute in the process of osmosis
• Examine the effects of osmosis on non-living…
Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane. A selectively permiable membrane is one that allows unrestricted passage of water, but not solute molecules or ions.
Different concentrations of solute molecules leads to different concentrations of free water molecules on either side of the membrane. On the side of the membrane with higher free water concentration (i.e. a lower concentration…
Osmosis and Diffusion via Semipermeable Membrane
Using Starch and Potato Cells
Osmosis is the tendency of molecules from a solvent to pass through a semipermeable membrane via passive transport, meaning that no energy needs to be provided for the movement of water molecules to happen. Cells that are living use active transport to change or maintain the concentration of many molecules inside of them to what's going on outside. All molecules travel from high concentration levels to…
The effect of osmosis on artificial cells with different concentrations of sucrose
Grand Valley State University
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In this study, we tested the validity of osmosis in artificial animal cells. Osmosis is the diffusion of free water across a membrane. The purpose of the study was to calculate the rate of osmosis in artificial cells containing different…
the spontaneous kinetic movement by which molecules move from an area of a high concentration to an area of low concentration. Diffusion continues until it reaches equilibrium. Osmosis is similar to Diffusion but it’s the process in which water moves across a semi-permeable membrane and goes to the higher concentration of solute.1
2.2. Important factors to Osmosis and Diffusion include Temperature, Concentration and Surface area to volume ratio. Temperature can affect the rate in which a solute…