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

What is the effect of different concentration of salt solution on the rate of osmosis in solanum tuberosum (potato)?

Extracts from this document...

Introduction

´╗┐Biology Internal Assessment IB Biology- Internal Assessment Lab Report * Osmosis experiment- Solanum tuberosum (Potato) Research Question: What is the effect of different concentration of salt solution on the rate of osmosis in solanum tuberosum (potato)? Hypothesis: The potato will lose weight and become shrank when they are put in salt solutions. The higher concentrated the solution, the more the potato shrinks. Osmosis is the passage of water at a cellular level from an area of low solute concentration to an area of high solute concentration through a membrane along a concentration gradient in order to equalize the level of water in each region. When potato strips are placed in concentrated salt solutions, they lose water by osmosis and they become "flaccid". They become swollen and hard. When the salt solution becomes more concentrated, more water would move out from the potato by osmosis. ...read more.

Middle

Repeat Step 4. for 1.00M, 2.00M, 3.00M and 4.00M concentration solutions with 5 strips each. 2. After 24 hours, place the potato strips again on the scale and work out the percentage change. Data collection: Table 2- Raw Data Table – Mass of Potato Strips – Pre- & Post-Experiment NaCl Concentration/M Potato Samples Initial Mass /g±0.01 Mass after Solution /g±0.01 0.00 Potato 1 8.60 2.21 Potato 2 9.20 2.02 Potato 3 9.40 2.03 Potato 4 8.70 1.98 Potato 5 8.90 2.10 1.00 Potato 1 8.65 1.71 Potato 2 9.45 1.54 Potato 3 8.70 1.78 Potato 4 9.45 1.66 Potato 5 8.95 1.68 2.00 Potato 1 9.10 1.52 Potato 2 8.35 1.43 Potato 3 8.95 1.66 Potato 4 9.15 1.73 Potato 5 8.65 1.45 3.00 Potato 1 8.15 1.46 Potato 2 7.95 1.36 Potato 3 9.75 1.27 Potato 4 8.85 1.38 Potato 5 8.75 1.25 4.00 ...read more.

Conclusion

Standard deviation 0.00 -74% -77% 0.02 -78% -78% -77% -76% 1.00 -82% -81% 0.01 -82% -81% -81% -81% 2.00 -83% -83% 0.01 -84% -82% -84% -83% 3.00 -83% -85% 0.02 -83% -87% -84% -86% 4.00 -92% -91% 0.02 -87% -92% -92% -91% Graph 1- The above average and standard deviation are plotted in the graph below to show the relationship to the percentage change in the mass of potato strips. Conclusion In conclusion, the results indicate that the concentration of salt solution have a correlation with the percentage change in mass. Graph 1 supports this theory. The higher the concentration of salt solution, the larger the percentage change in mass of potato strips. (The y-xis is in negative figures). The results for my control experiment did not turn out as I predicted. Instead of swollen, the strips also shrank after 24 hours in distilled water. ...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. Marked by a teacher

    Osmosis Internal Assessment (Biology)

    4 star(s)

    The difference between the two was 0.3 grams while the differences between the one hour intervals for all the other time intervals was only 0.1 grams, and after processsing the raw data, mean percent change of the mass of the potato strip at 2 hours did not fit in graph

  2. Marked by a teacher

    IB BIOLOGY INTERNAL POTATO OSMOSIS

    3 star(s)

    Peel a healthy large potato. 2) Using a cork borer, cut 15 pieces of 2 cm long potato chips. Make sure all chips are equal in size and solidity (wholeness), by observing each chip. 3) Place exactly 30 mL of water in a dry cup using a measuring cylinder. 4)

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

    Each of the condition will be repeated five times. * length of investigation time for each test tube Each investigation will be carrying out for 24 hours. * shape of the potato ( cylinder) Use the borer to cut the potato cylinder and then measure 5cm3 of potato cylinder with the ruler.

  2. internal assessment rate of transpiration

    However, the rate of transpiration is lower when the intensity of light is high. This is not suit the hypothesis that stated as before. This reaction occurs was explained in the discussion. Limitation and suggestion Limitation Evaluation Spring balance used is less sensitive to be used in measuring the mass of hibiscus twig.

  1. Osmosis Lab. What is the effect of concentration of blackcurrant squash on osmosis ...

    Dry the chips on a paper towel 5) Weigh the chips using the electronic balance and record the masses. 6) Place the chips in the test tubes and leave for at least 15 minutes.

  2. Testing the solute concentration of potato cells

    Measure the mass of a petri dish. 3. Make sure the cylinder to have the mass of 0.7 g on the petri dish 4. Ensure potato piece to have also the length of 3.5 cm using a 30 cm ruler.

  1. The effect on osmosis on the egg shell

    What is more, you have to try to keep the temperature of the room constant. 1. Prepare all equipment given in Materials and Equipment, wear apron and rubber gloves. 2. Put quail's eggs into large beakers [300 ml]. 3. Pour concentrated hydrochloric acid (1mole)

  2. biology extended essay - How different diets: vegetarian, vegan and a meat centered diet ...

    110/65 110/70 121/70 113/54 111/63 What is your body mass index? 21.8 20.9 18.8 18.4 20.8 How long have you had this diet? For three months All my life All my life All my life All my life 16 00511-062 08/09 5.1 DATA AND ANALYSIS Mean Ages For Each Category

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