This data was analyzed by calculating the cumulative change in weight for each dialysis bag. This was done from subtracting the weight of each bag from the initial weight of the bag. Doing so, allows the weight of each bag to be initially zero. For that, we must calculate the corrected cumulative change in weight. For each time interval of 10 minutes, we subtracted the change in weigh of bag 1 tap water from the weight of each bag at the specific time measure- this corrected any oscillations.
Results The corrected cumulative change in weight due to osmosis from different concentrations of sucrose and tap water, are shown in Figure One. This figure shows the weight change in grams for every interval of 10 minutes. Using the corrected cumulative change in weight eliminates bag 1 because its average rate of change will always be zero.
Below is a table of the bag weights at 10 minute intervals after being tested for an hour: Using the corrected cumulative change, we can monitor the rate of change for each bag, and correlate the rate of change to the rate of osmosis.
These results prove that the direction of osmosis does directly affect the rate of osmosis. If the slope begins with a negative x value, the solution is indeed a hypertonic solution, that when surrounding a cell will cause the cell to lose water, moving from a high concentration to a lower concentration Reece et al.
The slopes which begin with a positive x value demonstrate a hypotonic solution, which causes a cell to take in water Reece et al. This shows that the direction of osmosis is directed related to the rate of osmosis, or vice versa. The rate of osmosis ultimately determines the direction of osmosis.
Depending on which direction osmosis is going- hypertonic, isotonic or hypotonic, determines the rate of osmosis, or the rate of change for each dialysis bag. Or by the means of our experiment, the direction of osmosis was determined by the rate of change in each bag, or the rate of osmosis.
Discussion Throughout the study it was concluded that different concentrations of sucrose are allow different rates and directions of osmosis. The results show that the rate of osmosis is directly related to the direction of osmosis, or vice versa.
This proposal does not match with our quantitative prediction. This falsified hypothesis could be due to the explanation that in an animal cell, when a hypertonic solution, the cell experiences crenation.
The dialysis tubing creates a theoretical flaw in our experiment because the tubing has a molecular weight cut off of a maximum of 14 kilodaltons, while the average human cell may have a larger or smaller molecular weight cut off, allowing the cell to experience different tonicities. In order to obtain more accurate results, modifications should be made. More drastic concentrations of sucrose in the dialysis tubing should be tested in order to find the extremes of the rate of change for osmosis.
The study enhances the present scholarship in this area by exposing osmosis along a free energy gradient. However, other experiments could increase our knowledge about the relationship between concentration gradients and rates. An experiment that includes the idea that the selectively permeable membrane moves, might allow for more accurate results Patlak and Watters. The qualified location mirrors the volume of each side of the membrane, which affects the total number of particles on each side Patlak and Watters.
Our experiment exposes the ideal notion that there is no net movement of a solvent and the water is what diffuses across the membrane. Biology Laboratory Review. University of North Dakota, n. Patlak, Joseph and Chris Watters. A critical component affecting membrane performance will be the efficiency of membrane wetting during the initial charging of the FOB device.
Two-phase fluids are prone to form non-homogeneous foams in microgravity that may inhibit membrane wetting or reduce the effective wetted surface area of membranes. This FOB membrane is highly hydrophilic and is expected to wet thoroughly even in the presence of a non-homogeneous foam. Any detrimental effects of a non-homogeneous two-phase fluid contacting the membrane will be overcome by the highly hydrophilic nature of the membrane material.
The FOB hardware is comprised of five main components: Space Applications Forward osmosis technology has several potential applications for spaceflight. A small forward osmosis device could be incorporated into new long-exposure EVA suits in order to recycle metabolic wastewater i. Determining the effect of mechanical mixing on membrane performance may help inform suit designers in the placement of a device to maximize permeate production.
Suit elements that move freely, such as the legs, provide more mixing than the back for example. A forward osmosis device similar to the existing COTS product could be incorporated into new return vehicles as a mass and volume-efficient method of providing crews with post-splashdown fluids.
The existing lightweight COTS product can be tethered in seawater to produce a drinkable fluid. Current vehicle designs contemplate launching and returning only 2 kg of contingency water per crewmember. A very near term application of the technology is its ability to extend existing non-potable water resources on the ISS in off-nominal situations.
Currently, there are several broadly defined classes of water on the ISS including potable water, technical water, and wastewater. Potable water contains an effective concentration of a residual biocide and is intended for crew consumption.
Technical water is used for processes such as oxygen generation. Wastewater is produced from multiple sources that may include humidity condensate, hygiene water, urine, flush water, and gray water. The current COTS device can be reused for up to ten days. This provides a low mass alternative for the reduction of stockpiled water on the ISS and provides flexibility during off-nominal situations.
This filter is called the HydroPack, and will provide a clean, safe drink from any contaminated water source by simply dropping the product in water and leaving it to hydrate for ten hours.
The Forward Osmosis membrane blocks all contaminants and provides an electrolyte enhanced drink that is beneficial to anyone in a water emergency situation. This product has been successfully used in disaster relief efforts for the earthquakes in both Haiti and Chile and tested in the waters from the aftermath of Katrina. Ninety households in the flood prone village of Mudimbia took part in this ten-day project to prove the efficacy of the product as the better alternative to bottled water for the initial phase of disaster relief operations.
The results so far have been outstanding. The people of Mudimbia found the HydroPack had a great flavor and was easy to use. The lab results showed that hydration levels improved through the test period and that there was no contamination in the produced drink. One helicopter filled with HydroPacks is equivalent to sending 14 helicopters of bottled water. The logistical benefits combined with the new Kenya research project data illustrates that HydroPacks are the best solution for providing emergency hydration during the initial phase of disaster relief situations.
- Osmosis Introduction 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. The aim of the investigation is to find the variables that affect the rate of osmosis and how they affect the rate of reaction.
Essay # 4. Factors Controlling Osmosis: Presence of a perfectly semipermeable membrane is a must for the operation of osmosis. Osmosis is driven by two other factors: (i) Concentration of dissolved solute on the two sides of semipermeable membrane, (ii) Difference in pressure.
Osmosis is a special type of diffusion which involves the movement of water molecules through a partially permeable membrane. Osmosis occurs when water moves from an area of a higher concentration (distilled water) to an area of a lower concentration (sucrose solution). Osmosis is just the diffusion of water across a selectively permeable membrane from a more dilute region to a more concentrated region. Osmosis is crucial to the survival of an organism because it controls the balance of water between the cell and its surroundings.
Potato and Osmosis Investigation Essay. Potato and Osmosis Investigation PLANNING: (P) Some background Information: Water Potential and Living Plant Cells Plant Cells in Pure Water: If plant cells are placed in pure water (a hypotonic solution) water will initially move into the cells. Osmosis essay - Instead of concerning about term paper writing find the needed help here Entrust your essay to us and we will do our best for you Why worry about .