Osmotic pressure is a colligative property, meaning that the osmotic pressure depends on the molar concentration of the solute but not on its identity. An experiment was carried out by immersing two quail eggs in 5 solution with different concentration to investigate the effects of solute concentration on the rate of osmosis. Objective: -To observe the effect of different concentrations of sodium chloride on a de-shelled chicken’s egg -To explain the effects in terms of osmosis Research question: How do different concentrations of sodium chloride solution affect the difference in mass of two de-shelled quail eggs which represents the rate of osmosis, gram/day of the two de-shelled eggs? Hypothesis: The closer the concentration of sodium chloride solution to the concentration of isotonic solution, the smaller is the difference in mass of quail eggs thus the smaller is the rate of osmosis. When the concentration of sodium chloride solution is closer to the concentration of the isotonic solution, the difference in mass of the quail eggs is smaller; the smaller is the rate of osmosis.
Aim : To investigate the average different in mass of five quail’s eggs in five different concentration of sodium chloride solution. Research question : How do the five different concentration of sodium chloride solution affect the average different in mass of five quail’s eggs ? Introduction : In this experiment, we are investigating the effect of osmosis when quail’s egg are immersed in different concentration of sodium chloride solution. “When a cell membrane is said to be selectively permeable, it means that the cell membrane controls what substances pass in and out through the membrane. This characteristic of cell membranes plays a great role in passive transport.
Investigation of Osmosis in Quails’ (Coturnix japonica) Egg Research Question What is the effect of different concentration of sodium hydroxide solution on de-shelled quails’ egg? The concentration of sodium chloride used is 0%, 5%, 10%, 15% and 20%. How does the different concentration of sodium hydroxide solution affect the change of mass of quail’s eggs when the eggs are immersed in each solution and left for more than 24 hours? Variables variables Method of Controlling Independent Concentration of Sodium chloride Solution The concentration of sodium hydroxide solution prepared and used for this experiment is 0%, 5%, 10%, 15% and 20%. Dependent The average change of mass of quails egg The initial mass of each quails’ eggs is weighed and the eggs is weighed again after 24 hours.
If the concentration of water in a cell is lower than the concentration of water in the solute the solution is said to be hypotonic and the cells swell because they will take up water. It is possible for animal cells to swell to the point of bursting because they do not have cell walls to limit the amount of water that enters. Plant cells hold the excess water in their large vacuoles and have cell walls so they remain rigid and further uptake of water will not happen. When the concentration of water in a cell is higher than the concentration of water in the solute the solution is said to be hypertonic and the cells will shrink because the water will diffuse from the cell into the solution. A plant whose cells are in a hypertonic solution will appear droopy because there is a loss of turgor pressure in each cell.
When processing onions they are brought from harvesting and stored in ambient conditions until the irradiation takes place, they are then conveyed into an irradiation chamber with thick concrete walls ensuring no rays escape, and the gamma ray source is taken out of the water pool. The onions are then exposed to a low dose (up to 1kGy) of gamma rays, known as radurization, which can inhibit insects and parasite reproduction and inhibit rotting therefore extending shelf life. The onions are then conveyed out of the irradiated chamber to be
Using a thin-layer chromatography, or TLC, the position in which molecules stop advancing upwards could be observed. By applying the TLC method to this experiment, different traveling distances of a certain chemical, with changing salt concentrations of water, can be measured. In this investigation, however, sheets of tissue papers were dipped into salt water with different concentrations and soaked until the water traveled to the top, so the method was different from the TLC experiment. Consequently, the volume of liquid absorbed will likely not change with different salt concentrations since every time the paper will be dipped into the solution until it completely absorbed water, each time in the same manner. Moreover, the mass of solution absorbed will increase because the density of the solution increases with increasing concentration.
IB Biology Cytology Laboratory 12/12/12 Osmosis in Red Onion Cells WRITE-UP Background Information: Osmosis is the diffusion of water from an area of low concentration to an area of high concentration across a semi-permeable membrane. The purpose of this lab is to compare the four different types of solutions effect on the size of the vacuole. Hypothesis # 1: If distilled water is added to the membrane of the red onion cell then that vacuole will grow that most or stay the same because is that same concentration inside and outside the cell which mean no net movement and that cell will stay the same. Hypothesis # 2: If 1 % of saline solution is added to the membrane of the red onion cell then, that vacuole will start to slowly decrease size because water will start to move towards that higher solute. But it won’t be as strong as if that solute were higher.
Esteban Pellot Knowing Osmosis Introduction: Osmosis is the diffusion of water molecules that crosses the semipermeable membrane from a high concentration of water to a low concentration of water. The egg is a good product to demonstrate osmosis. Students can remove the shell of the egg to see how the osmosis works in the cell membrane of the egg, Problem: What happens when a student puts a egg in the solutions hypotonic, hypertonic, and isotonic? Hypothesis: A hypotonic solution will increase the mass of the egg, a hypertonic will decrease the mass of the egg, and a isotonic won’t affect the mass of the egg. Materials: The materials that are included in the lab are four jars, three eggs, water, vinegar, syrup, pencil or pen, paper, markers, and tape.
When these factors vary, enzymes may change in shape so it will not be able to bond to the specific substance anymore. What is trypsin? Trypsin is produced in the pancreas as typsinogen originally allowing metabolic control. It is used widely in various biotechnological processes because it is very easy to be purified. Method: Material: • Trypsin • Casein • Water bath (to keep the temperature constant) • Colorimeter (to measure the rate of enzyme activity) • Thermometer • Test Tubes (to contain the casein and the buffer solution) • Stop watch (to control and measure the time) • Distilled water (to mix with trypsin to produce the buffer solution) • Test tube rack (to prevent the tubes rolling and smashing) Protocol: • Put 2.5 cm³ of 5% with reconstituted casein in 6 of the test
If the value of spectrophotometer show reading more than 20 mg/m3 is found, the eutrophication henomenon might occur. OBJECTIVE 1) To determine the amount of chlorophyll a content in water sample. APPARATUS AND REAGENT * UV-1601 SHIMADZU UV-Visible Spectrophotometer * Filtering set * Vacuum pump * 0.47 mm GFC filter paper * Centrifuge tube * Quartz 1 cm curvette * 90% acetone * Magnesium carbonate (MgCO3) METHODOLOGY 1) A polyethylene bottle containing the seawater sample is inverted into the Milipore filtering equipment containing a membrane of fiberglass filter. The sample is allowed to filter under half atmospheric pressure vacuum. 2) Several drops of MgCO3 solution is added to the seawater as it is being filtered.