Mass changes of potato pieces bathed in NaCl solutions Graph 2: Grass contains water and the salt does not. However 5 minutes is a small amount of time and there is no assurance that all chips dried to the same extent and did not lose water from insight of the cells. When the potato was distributed into 0.
When the sucrose solution was at 0. Repeat for every piece of potato. In my experiment I decided to cut potato into equally sized chips. Measure each one of the 10 pieces and in order to equalize their mass chop, or scrape off some of the piece if needed. The main objective of this lab was to obtain a better understanding of osmosis by seeing it in action.
Unfortunately it did not prevented me from systematic error during the preparation of mediums —I had to read the values from pipette with eye and this may be a source of error. Significance of this would affect Biology lab report ib hl osmosis data as is contradicts its purpose as a controlled variable.
This is calculated by dividing the absolute average mass change of each solution shown in Table 3 and dividing it by the maximum time used in the experiment, which is 35min.
We converted the mass to the percentage to graph it by using this formula: Diffusion is the movement of particles from an area of high concentration to low concentration. In contrast, hypotonic is when the solution has lower concentration of the solute.
Using this information, another experiment was conducted with potato cores submerged in sucrose solution to further examine osmosis. I found a good lab report documents are going to cite the problem or transmitted, In ib ess the lab report.
Movement of substances across cell membranes. Secondly, the sizes the potatoes were chopped in were not exactly the same because more attention was given to having the same mass and thus neglecting the size which leads to different surface to volume ratio and affects the results.
Based on the graph, kiwi is the most sugar concentrated fruit with an isotonic number of 0. Aligning with our predictions the potato in Beaker 4 gained weight of 0.
A proper timer should be used to count the time intervals. The pieces that will be placed in the solution with the lowest concentration of salt will have small weight loss. In an isotonic solution, the plant cell does not have enough turgor pressure to keep is shape.
Beaker was filled with ml of water. Our results may also be slightly skewed due to the time constraints that we were facing. A more specified form of diffusion is osmosis, what was primarily focused on in this lab, and it is the movement of water across a membrane, again from an area of high concentration to low concentration.
The mass of cells decreased, which means that potato chips lost water. Leave for 24 hours. All trials used the same sized large test tubes. This method will completely eliminate the chances of penetration of the potato pieces thus, increasing the reliability of the data produced and of the investigation.
Encyclopaedia Britannica, Standard deviation. Environmental factors could change results as well, if temperature is higher than room temperature, osmosis could occur faster than usual.
This process was also repeated five times for the each concentration to increase the reliability. Conclusion The object of this experiment was to find the fruit that has the most concentration of glucose.
Due to osmosis, the water solution in the grass of which is of higher concentration moves to the area of lower concentration in the salt to try to make their concentrations equal. When measuring the mass of the final potato pieces, only two ply of paper towel were used to dry of the excess solutions.
It is not a true measure of reality. In a hypertonic medium Solanum tuberosum shrivelled, especially those samples taken from solutions with high concentration of blackcurrant squash.
This experiment can be used to make sports drinks because concentration is really important in isotonic sports drinks.ALICE DU LAC 1ERE IB MONDAY 22ND NOVEMBER IB BIOLOGY – OSMOSIS INTERNAL ASSESMENT Lab Report: OSMOSIS IN ONION CELLS- 27/10/11 In osmosis the percentage change has an effect on the cell when there is a substance which are dissolved in water who are introduced into the cell, thats is because the water molecules that bond to a solute can.
This is a holistic judgement, students can show personal engagement in; the choice of topic or the reason why the student chose it, as mentioned above. Osmosis Potato Lab Report Biology 4u Essay; Osmosis Potato Lab Report Biology 4u Essay. Words: Pages: 9.
Introduction Essay on Biology Lab Report Ib Hl Osmosis. Biology Lab Report 2 Investigating the phenomenon of Osmosis in plant tissues: Potato in different concentrations of NaCl Tutor: Maria Tsaousidou By. Osmosis Potato Lab Report Biology 4u Essay Introduction The movement of water molecules across a semi-permeable membrane is the process of osmosis.
If there is a solute and a solvent, each containing different concentration levels, then the water would move along its concentration gradient until each side of the membrane are equal.
Sep 24, · Biology Lab Report: Osmosis Done by: Seonlim Lee (Lynn) G.9B Purpose - To find the most sugar concentrated fruit and to know what will happen if we put the kiwi inside the water with glucose.
Hypothesis - Since watermelon contain loads of water, watermelon will be the most sugar concentrated fruit.
A lab project along with a report that counts as 20% of your IB exam scores (written exam counts for the other 80%) Group 4 Project: 10 hours for SL and HL Students are separated into groups and must conduct an experiment and write a report.Download