Osmosis Potato Lab Report Biology 4u Essay

This experiment was conducted to observe the effect of a certain amount of sucrose in a solution on white potato cylinders. About five or six pieces of potato went into six different solutions that were in increments of 2 m and were labeled by color. The point of this experiment was to see which solutions were hypertonic, hypotonic, or isotonic to a piece of potato.

An investigation to find the water potential of potato and carrot tubers in a sucrose solution, of concentration 0.00 – 0.50Mol, over a 24 hour period

As the Concentration of the Sucrose Solution decreases, the more the potato’s mass increases. This is due to the solution being hypertonic. So, as the solute concentration gets lower, the potato’s water concentration will get higher, therefore more water particles from the solution will absorbed by the potato. Some changed very little in mass because the concentrations of the H2O molecules in the potato and outside the potato were equal. This equality in concentration is called Isotonic.

The Diffusion and Osmosis Lab determines the molarities of various sucrose solutions based on change in mass. Using table sugar in different amount of molar concentration 0.0M, 0.2M, 0.4M, 0.6M, 0.8M and 1.0M. The molarity of the solution of the sucrose solution in the dialysis tubing determines the amount of water that either move into the bag or out the bag, which also means its mass changed.

I know that osmosis will occur in the vegetables, but I am not sure of

All cells contain membranes that are selectively permeable, allowing certain things to pass into and leave out of the cell. The process in which molecules of a substance move from an area of high concentration to areas of low concentration is called Diffusion. Whereas Osmosis is the process in which water crosses membranes from regions of high water concentration to areas with low water concentration. While molecules in diffusion move down a concentration gradient, molecules during osmosis both move down a concentration gradient as well as across it. Both diffusion, and osmosis are types of passive transport, which do not require help.

After soaking, the cylinders were reweighed to determine their final weights. The initial weights were then subtracted from the final weights to find the change in weights. To determine the percentage of change in the potato, the values for change in weight were divided by the initial weights of the cylinder. I used the values for percentage of change and the different sucrose concentrations to create a scatter plot In Excel, which also calculated the y-intercept equation and the R-squared value. I also added a trend line, which helped me determine what concentration of sucrose was isotonic (same concentration of solutes) to the potato. By setting the y-intercept to 0 and inputting the values for the slope in the equation, I was able to solve for x and determine that the osmolarity of the potato was .48 (M). Therefore, if placed in a solution of .48(M) of sucrose there should be no net change in the weight of the potato. The results of the studies supported my prediction that hypotonic solutions will increase the weight of the potato and hypertonic solutions will decrease the weight of the

Osmosis is the passive transport of water from a place with a high concentration of water to a lower concentration of water. This applies to solutes in a solution, but is called diffusion instead. Ultimately, the water and/or solutes are trying to get to an equilibrium with the environment around it. There are different ways to reference this process happening in cells. One of which is called a hypertonic solution. A hypertonic solution has more solutes in its solution than another solution. Another is called a hypotonic solution, in which it has less solutes than another solution. When two solutions have an equal amount of solutes, they are called an isotonic solution.

Osmosis is the movement of water molecules from high concentration to low concentration through semipermeable membranes, caused by the difference in concentrations on the two sides of a membrane (Rbowen, L.). It occurs in both animals and plants cells. In human bodies, the process of osmosis is primarily found in the kidneys, in the glomerulus. In plants, osmosis is carried out everywhere within the cells of the plant (World Book, 1997). This can be shown by an experiment with potato and glucose/salt solution. The experiment requires putting a piece (or more) of potatoes into glucose or salt solution to see the result of osmosis (a hypertonic type of solution is mostly used as it would give the most prominent visual prove of

Figure 1. Comparison of the percent weight changes of three solutions and the osmolality (number of particles of solute/L) for each solution.

In this experiment we estimated the osmolarity of potato tuber tissue by submersing different potato cores into sucrose solutions of 0.0-0.6M, and weighing the potato. We concluded that the osmolarity of the potato was about 0.4M since the weight of the potato did not change after it was incubated in the solution

This can be found by dividing the difference of the final weight and initial weight by the initial weight. This is useful when determining whether water diffused into the potato or out of it. Keep in mind that a negative percent means that water left the potato instead of diffusing into it. Results: As table 1 shows, I observed that the results supported my hypothesis that the lower Molarity solutions diffused more water into the potato than the higher Molarity solutions did.

5. • Will my potato sizes be the same? • If my potatoes are different sizes will it drastically affect my experiment? • Will the water evaporate at different rates throughout the experiment?

Experiment to Investigate Osmosis in Potatoes The aim of this experiment is to investigate the movement of water in and out of plant cells. The cells chosen for study will be taken from potato tubers. Firstly I will explain what osmosis is. Osmosis is the passage of water from a region of high water concentration through a semi permeable membrane to a region of low water concentration.

Introduction: Osmosis is the movement of water through a semi permeable membrane, separating solutions of different concentrations. The water passes from a region of high concentration to a region of low concentration, until the two concentrations are equal in concentrations of water.