The first experiment with 1 M sucrose in the bag and distilled water in the beaker had almost exactly the same results. The masses were relatively the same the difference have could been from the amount of liquid that was placed inside of each of the bags. The second experiment with 5% Ovalbumin in the bag and 1 M sucrose in the beaker had almost exactly the same results. The masses were relatively the same the difference could have been from the amount of liquid that was placed inside the bag.…
Osmosis is the net diffusion of water across a membrane from a region of high concentration to low…
8.Osmolality measures the concentration of all chemical particles found in the fluid part of blood.Normal values range from 275 to 295. The patient has a osmolality of 351.1…
Associated with symptoms that result from cell shrinkage as water is pulled into vascular system…
Osmosis is the of a solvent across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. The water being the solvent can move across the membrane but the salt…
Define osmosis: Osmosis can be defined as the movement of solvent molecules across a semipermeable or selectively permeable membrane ,from a region of lower concentration of the solute to that of a higher concentration till equilibrium is attained.…
Note: in the “Going sugar-free” series, when saying “sugar”, I am referring to “table sugar” also known as “sucrose”, extracted from sugarcane or beet sugar.…
Introduction: Osmosis is the diffusion of water from a higher concentration to a lower one through a semi-permeable membrane and occurs in the cells of organisms. It is affected by the addition of solute which would lower the water potential, making water potential and solute concentration inversely related. The concept of osmosis loosely described is that the presence of more solute outside the cell means the presence of less solvent (or water molecules in this case) and vice versa; the goal of osmosis is for the water molecules inside and outside of the cell to be equal, causing equilibrium and a stop to net water movement. The goal for a recent lab was to test whether cubes of potato would gain or lose weight depending on the amount of molar concentration of sucrose they soaked in. Solutions made of different molar concentrations of the solute sucrose were prepared before this lab. Potato cubes were weighed and recorded as the initial mass in the data. Four cubes of potato were placed into 100 mL of each solution and let stand overnight. The cubes were then taken out for the final total mass to be measured and recorded. In this experiment, the potato cubes were the dependent variables, and the molar concentrations were the independent or manipulated variables.…
This makes sense because the farther the cell is from osmotic equilibrium, it will gain weight faster (McCutcheon 1926). This supported our prediction. The increase in osmotic rate because of an increase in solute concentration is because water moves from a solution of low solute concentration to a solution with high solute concentration. This means water rushes into a solute of higher concentration faster than a low concentration. This is why the artificial cell with 60% sucrose solution had the highest corrected cumulative change in weight and the fastest osmotic rate. The artificial cell containing water in 40% sucrose solution had a negative osmotic rate because water was leaving the cell and osmosis was occurring in the opposite direction. In this experiment, only one bag of water was placed in 40% sucrose solution. In other experiments, adding two more bags of water and placing them in 20% and 60% sucrose solutions could be tested to see if the rate of osmosis is similar to their 20% and 60% bag counterparts in water. Also, an experiment could be performed to show temperature is a factor in osmotic rates by having the same solute concentration in solutions and placing bags filled with water into them, each having a distinct…
The main purpose of this paper is to assess the rate of change with osmosis for different concentrations of sucrose in artificial cells. Since the human body is composed of trillions of cells that contain roughly 85% of water, makes osmosis a very important concept (Carmichael, Grabe and Wenger). The forces that affect osmosis are the concentrations of solutes surrounding the cell or inside of the cell. Water will then move across the cell membrane and create a balance of water between the cell and its environment (Reece et al. 133). In order to calculate the average rate of change for our artificial cells, we must understand tonicity as the ability of a nearby solution to cause a cell to lose or gain water, depending on its concentration of non-penetrating solutes relative to solutes inside the cell (Reece et al. 133). The dialysis bags used in this experiment have membranes which are selectively permeable, which only allows particles specifically small enough to pass through (Carmichael, Grabe and Wenger). In a hypotonic solution, water…
The purpose of this lab was to determine the concentration of NaCl or sodium chloride that is isotonic to elodea cells. First off, what is osmosis? Osmosis is this huge net of molecules moving through semi-permeable membrane to high concentration to direction where everything becomes balanced. This brings us to what osmolality is. Osmolality is related to osmosis and we know that osmosis has something to do with water so that being said, osmolality is number of osmoles of solute per liter in solution. So, what does osmolality depend on? It mostly depends on number of particles in chemical solution but not the identity of molecules and ions. Since we were dealing with elodea and NaCl (which is M) and were trying to figure out which molarity would cause us to get isotonic solution. Based on the experiments that we before trying to figure out the isotonic solution, we were doing hypotonic and hypertonic solutions, so we had a slight idea what to do and Mr.…
6. Osmosis the tendency of a fluid, usually water, to pass through a semipermeable membrane into a solution where the solvent concentration is higher,…
Answer: Osmotic pressure is the measure of the tendency for osmotic flow to occur. Osmotic flow is from a solvent to a solution. This is the amount of pressure that needs to be applied from the outside to prevent osmosis. Fluid volume might be connected to osmotic pressure as the amount of pressure required to contain a specific volume of fluid in a container. Both pressures are external.…
The diffusion of water across a semi-permeable membrane is called osmosis. When water diffuses, the water molecules move from a hypotonic environment to a hypertonic environment. Hypotonic means less concentrated than another solution. Hypertonic means more concentrated than another solution. If two solutions have equal concentration, they are said to be istonic…
When conducting the osmosis lab, the initial tonicity of the cell was 0 grams. The beginning weight of the cell was 18.75 grams and…
