• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Osmosis in potato

Extracts from this document...

Introduction

Osmosis in potato 25.9.2007 Veronika Brantov´┐Ż Mr. Rod Anderson Defining problem and selection variables Purpose: The purpose of the experiment is to show how varying the concentration of salt solution affects osmosis in a potato piece. Background: * Osmosis: Diffusion of water molecules across a membrane from high concentration to low concentration. (Biology, Sixth edition - Campbell, Reece) * Hypotonic: higher concentration of solute than in the cytoplasm - water flows out of the cell * Hypertonic: lower concentration of solute than in the cytoplasm - water flows into the cell * Distilled water: pure H2O Table not necessary for this purpose Hypothesis: If I increase the concentration of salt then the amount of water moving in or out the potato will change and increase or decrease its mass. Prediction: According to the hypothesis my prediction is that the potato mass will decrease with increase of salt solution and increase in distilled water. ...read more.

Middle

I make sure with the ruler that all pieces have the same length - 25mm, if not I trim them with a chipper I also have to make sure all pieces weight the same - 5g. I put one piece of potato in each beaker. I leave the potato in each solution for 30 minutes the total, but at 15 minutes I remeasure the length of potato pieces to see if any change has happened and also weight them. I write down the data measured after 15 minutes in each solution and after 30 minutes in the solution. I follow normal safety procedure during this lab. Error reduction - clean the scale before placing the pot - take all potato pieces out at the same time Method of Collection Procedure is proper and goes in order I stated above. Presentation of data: Weight of potato pieces Distilled water Solution of 2g of salt Solution of 4g of salt 0 minute 5g 5g 5g 15 minute 5.15g 4.9g 4.8g 30 minutes 5.29g 4.79g ...read more.

Conclusion

with distilled water. As we can see there were some errors probably caused by different sizes of cells, which we cannot reduced.\ %ERROR - the percentage error will be based on the uncertaintz and actual values obtained Evaluating Weaknesses: I took only two different sets of data, at 15 minutes and at 30 minutes; if I did couple more times I could see the results better. Limitations: The time for this lab and the amount of tools was limited and slowed the process down. Improving Ways of improvement * Calculating the mass change in the potato piece, by measuring both length and width. * Calculating a value - weight * doing it more times so that it is more accurate Related to weakness/limitations To fill in the gaps in my data I could have taken different results, i.e. 1g, 3g, 5g of salt. This way I could have found more accurate results. Also to make my experiment better I could have repeated it more times, and possibly have worked with someone else, as I was working on my own. ?? ?? ?? ?? 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. The effect of concentration of sucrose solution on the osmosis in potato

    Compare to Graph 2, the r2 value has increase to 0.9, it suggest that there is a regulate pattern for the relationship between the concentration of sucrose solution and the mass of potato. The Standard deviations in this experiment are all small, less than 1.0, then the results of the

  2. The effect on osmosis on the egg shell

    changes the direction of osmosis. I think that procedure and methods that were carried out were as good as available equipment, apparatus and time allowed. Limitations: * Time of the experiment was too short, so further changes in mass could not be observed * Beakers had different diameters, as the amount of solution was equal,

  1. Osmosis Experiment. This experiment is to consider how salinity influences osmosis in potato cells.

    for a longer period of time than the potato cubes cut just before they are placed into the test tubes. So, option 2 which contains a reasonable amount of 5 potato cubes and accurate results would be the best option.

  2. Testing the solute concentration of potato cells

    Particularly, channel protein is one of passive process called facilitated diffusion. Diffusion is the passive movement of particles from a region of high concentration to that of low concentration. Simple diffusion takes place just through the phospholipid bilayer when particles are small and non-polar (hydrophobic)

  1. Biology Scientific Events

    RNA interference could change medicine forever. Works cited Pollack, Andrew. "The Promise and Power of RNA." The New York Times. 11 Nov. 2008.17 Nov. 2008 http://www.nytimes.com/2008/11/11/science/11rna.html?scp=1&sq=The%20 Promise%20and%20Power%20of%20RNA&st=cse>. People whose bodies make an unusually active form of a certain protein tend to have dangerously high levels of cholesterol.

  2. Biology independent investigation, Ecology

    One of the most reliable ways to measure the development of a plant is to measure is dry weight. This means that water will not be a contributing factor to the weight and the only factor will be the actually plant mass and therefore the amount of growth.

  1. Activated sludge wastewater treatment system and method

    A waste processing system as defined in claim 35, wherein said chemical flocculent comprises: a cationic emulsion polymer. 37. A method of removing contaminants from a wastewater stream, comprising: admitting wastewater from said wastewater stream into a first container; introducing activated sludge into said first container to react with

  2. Investigation of osmosis in potato strips by measuring the length of the strips after ...

    which in this case is the 0.0mol*dm-3 concentration of sucrose through partially permeable membranes (potato cell membrane) to a region of low water concentration (hypertonic solution) which in this case is the concentration inside the cells of potato strips. There was a difference between the solute concentrations between the two solutions.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work