Osmosis in potatoes lab report. IB Biology IA Coursework: A Detailed Guide For Students and Parents 2022-11-07
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Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a semi-permeable membrane. In this lab, we will be studying osmosis in potatoes by cutting potato chips and placing them in different concentrations of sucrose solutions.
To begin the experiment, we first need to gather the necessary materials: potatoes, sucrose solutions of different concentrations, a knife, a cutting board, a balance, a graduated cylinder, and petri dishes or test tubes.
Next, we will cut the potatoes into chips using the knife and cutting board. It is important to make sure that the chips are all roughly the same size and thickness so that they will be affected by the sucrose solutions in the same way. Weigh the chips on the balance and record their mass.
Next, we will prepare the sucrose solutions. We will need a range of concentrations, from a high concentration to a low concentration. For example, we might use a 1M sucrose solution, a 0.5M sucrose solution, a 0.1M sucrose solution, and a 0M sucrose solution (water).
Now we can start the experiment. Take a potato chip and place it in the 1M sucrose solution. Observe and record any changes in the chip's appearance, and measure its mass again using the balance. Repeat this process for the other concentrations of sucrose solution.
After observing and recording the results, we can analyze the data to determine the effect of the sucrose solutions on the potato chips. We should see that in the high concentration sucrose solutions, the potato chips will lose mass as water molecules move out of the potato chips and into the sucrose solution. In the low concentration sucrose solutions, the potato chips will gain mass as water molecules move from the sucrose solution into the potato chips.
In conclusion, the osmosis lab demonstrated the movement of water molecules through a semi-permeable membrane. By observing and measuring the mass of potato chips in different concentrations of sucrose solutions, we were able to see the effect of osmosis on the movement of water molecules. Understanding osmosis can be useful in a variety of applications, such as in the study of cell membrane function and in the preservation of food.
Experiment Library for Kids
Low boiling point liquids acetone, 70% solution ethyl alcohol, 70% solution isopropyl alcohol , 30 mL F. The Atomic Theory goes farther to say that there is a difference between elements and compounds. However, it is to be noted that the data being collected points out some significant differences, as well as similar numbers of oxygen being produced. Also the measurements were only taken before and after the 94 hours, to show the rate of osmosis results should have been taken more frequently. When put in a separating funnel, paraffin float on water. If you plan effectively and spend an afternoon completing your preliminary work, you should collect plenty of data that lends itself well to analysis and processing.
Effect of Salt Concentration on Osmosis in Potato Cells Lab Answers
Scientists Get Excited When They Use Numbers For Good Reason Why do scientists get excited about numbers? This means the exam is worth 80% — this gives you an idea of where you should be placing your priorities in the long term. If you construct a bad research question…. Do the same procedure for the two sets of alumina balls. Both sets of data showed solutions with higher concentration is hypertonic compared to the potato cells meaning the water would travel to the solution because it contained more salt. Distinction between Compounds and Mixtures Preparation of a Mixture of Iron and Sulphur Take about 7g of freshly powdered iron, and a little more than 4 g of sulphur. If the potato cytoplasm is hypertonic relative to the sucrose solution, then water will move from the sucrose solution into the potato, resulting in an increase in mass of the sweet potato. Chemicals, Pharmaceuticals and Petroleum 4.
At your workstation have an area where you can write down notes and qualitative word data. Fill the pycnometer with the liquid sample up to its brim, and insert the stopper carefully. The test here is to look at your preliminary result data — is it patchy? We need water for transport lakes and oceans , Generation of power, hydroelectricity , drinking industrial processes, manufacturing and cooling among others. A procedure repeating each run 5 times, would be the best for minimizing errors that could occur, due to the 5x5 rule. The dependant variable was the rate of osmosis measured by the average percentage change in mass. Pitfall2: Selecting too many IVs If in doubt stick to one independent variable, or two maximum.
The reason for asking this question must be obvious. The time investment here will pay you back immensely as you start your experiment for real. Compute for the volume of the alumina balls by subtracting the initial volume from the final volume of water in the graduated cylinder. They move from a region of low concentration hypotonic to a region of high concentration hypertonic. Wait for about one minute for the ink drop to spread further. Conductors and Insulators The ability to conduct electricity is the major simple distinction between elements that are metals and non-metals. The rate of photosynthesis Dependent Changed by the colour of light, collected with stop watch and counted by produced bubbles.
You have to be able to substantiate your question. Signs that a chemical reaction has happened include: a Colour changes, b Temperature changes c Change in mass Examples of changes Physical changes 1. Aquaculture, the cultivation of fish in ponds uses oxygenated water to increase yields. This is called rusting of iron. Another problem can be included with pointing onto the water, which, for better results und and a higher rate of photosynthesis, should be changed to soda water, or at least, should provide a warm temperature and not as cold as the water was within Run No.
IB Biology IA Coursework: A Detailed Guide For Students and Parents
Mark on it where the following items are usually kept. Turn on the gas tap. The requirements for the IB are identical for both SL and HL students. For use in vacuum distillation, the jacket is sealed to the inner tube. Record and compare the resulting density of the liquid with the standard value at room temperature. Any acid will have a pH of less than 7.
Remember that most chemicals are flammable, toxic, carcinogenic or all three. Communicate your ideas and discoveries in the most succinct and accurate way. How do they feel? Soil remains above the filter paper. The accuracy of a human starting the stopwatch at the exact time the potatoes were submerged is unreliable because of their reaction time. Chemicals We deal with chemicals all day long. The mouth of this test-tube is closed with a cork and it is kept aside for about one week.
Carefully push the corer all the way through the potato, and remove the core carefully so the potato piece stays intact. Procedure: What you must do to complete the experiment. Don't Taste or Sniff Chemicals For many chemicals, if you can smell them then you are exposing yourself to a dose that can harm you!. In reality, H + is a single proton, and does not exist on its own. They are the base for everything in the Universe! Title, Research Question , Hypothesis, Background Information, Variables, Apparatus, Chemicals and Materials, Safety, Ethical and Environmental Issues, Preliminary work, Prediction Graph, Method.
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All separations depend one way or other on the physical properties of substances in the mixture. Tie long hair back. The gas is approximately 1. So in short the IB biology IA is a great chance for students to show their capacities in both academic and life skills. Gas jar A gas jar is a long wide glass apparatus with a wide base. The warmer the laboratory, the more crystals form when it cools down at night! Beakers Made of heat resistant borosilicate glass, withstanding temperatures up to 680°C, the beaker features a large marking spot, graduations and pouring spout.
Effect of Sucrose Concentration on the Rate of Osmosis
It is not safe to put a metal into an acid which is above magnesium in the reactivity series. How does the mass of the potato strips change in each solution? Carefully drop an alumina ball to the graduated cylinder and measure the new volume. Kerosene and turpentine oil form uniform mixture Explanation Ethanol is miscible in Water. Leave the laboratory through the emergency door. Apparatus are designed for the purpose they are intended in a school chemistry laboratory: a Apparatus for measuring volume 1. If a mixture contain insoluble solid,they are filtered out.