• 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...


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.


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.


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)

    How the potato strips were cut and stored By leaving the potato strips on the cutting mat while cutting them, they were exposed to the external environment, causing oxidation of some potato strips to occur before immersion. Covering the potato strips with ceran wrap while cutting the others would minimise

  2. Marked by a teacher


    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. 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)

  1. In this extended essay I am looking at the effect of different kind of ...

    Remember to bury those 4 cm in depth from the top of the soil. Also remember to prepare soil as mentioned in variable above. Observations: The radicle of the seed has grown a little longer in length on each category of plant.

  2. internal assessment rate of transpiration

    Pockets of air saturated with water vapour tend to form near stomata in still air, which reduce the rate of transpiration. Wind blows the saturated air away and so increases the rate of transpiration. Conclusion From the observation throughout the experiment, the rate of transpiration is higher when the humidity of air is low and speed of wind is high.

  1. Testing the solute concentration of potato cells

    � electronic balance (� 0.0005 g) � 5 g of potato � stopwatch � a 30 cm ruler (� 0.1 cm) � petri dish � paper towel � tweezer � a chopping board � scalpel Method 1. Cut potato into a shape of cylinder on a chopping board and using a cork borer and a scalpel.

  2. Investigating the Effects of Salt on Seed Germination

    As mentioned above, one of the main errors in our data and measurements was the issue of seeds falling of the cotton balls and into empty space away from the water and salt solution. As a result of this, the data collected could be less reliable in a few tests

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