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

Estimation of Water Potential of Potato Tuber Cells

Extracts from this document...

Introduction

Estimation of Water Potential of Potato Tuber Cells Introduction This experiment is to find out the water potential of potato cells. Water potential is the ability of water to move and is represented by the Greek letter ? (pronounced "sy"). It tells us which way water will move and how fast. Water potential is always measured as a negative number; this is because the water potential of pure water at atmospheric pressure is zero therefore the stronger a solution is the more negative the number. This is because a solution has solutes present and solute molecules slow the movement of the water molecules, therefore always making the water potential of a solution less than zero. ...read more.

Middle

There are two factors that influence water potential; * The concentration of solutes inside the cell * The pressure exerted on the cell contents by the stretched call surface membrane or cell wall. Results Table Concentration (m) Mass before (g) Mass after (g) Change in Mass(g) 0 (distilled water) 1.32 1.47 0.15 0.2 1.35 1.36 0.01 0.4 1.24 1.16 -0.08 0.6 1.38 1.05 -0.33 0.8 1.57 1.20 -0.37 1 1.32 0.83 -0.49 Method First we collected all of our equipment and labelled each test tube with the different concentrations of sucrose to go into it and placed them in a test tube, we filled each test tube half way with the following solutions; 0(distilled water), 0.2, 0.4, 0.6, 0.8 and 1m of sucrose solutions. ...read more.

Conclusion

We repeated that for each set of discs, 6 in all. Then we placed each set of discs in each test tube of solution and put the stoppers on top. They were left for 30 minutes n then the weights of the discs were taken again. Apparatus Diagram Test Tubes (x6) Test Tube Rack (x1) Stoppers (x6) Potato (x1) Cork Borer (Number 5) (x1) Scalpel (x1) Sucrose Solution Percentage Change To work out the percentage change you use this equation; % change = change in mass original mass Concentration (m) Start Mass Change in Mass Percentage Change in Mass(%) 0 1.32 0.15 11.4 0.2 1.35 0.01 0.74 0.4 1.24 -0.08 -64.5 0.6 1.38 -0.33 -23.9 0.8 1.57 -0.37 -23.6 1 1.32 -0.49 -37.1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry 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 GCSE Aqueous Chemistry essays

  1. Hydrogen Fuel Cells

    Hydrogen-fuel cells are a critical component to the environment because this will improve air quality, reduce greenhouse gas emissions and extend the life of fossil fuels as well.

  2. Investigate the influence of a variety of treatments on the permeability of the cell ...

    * After 15 minutes pour the contents of each tube into a labelled curvette for use in the colorimeter. Be sure not to label the curvette below the top 1cm as this could interfere with the light beam. * Calibrate the colorimeter and read the percentage transmission for each treatment.

  1. Determine the concentration of lime water.

    = 8.12gdm3 Evaluation My practical experiment went quite well and I got a variety of results, which were suitable for the task given. My results show that I got two identical results and one just 1.1cm3 off. Which suggests that I have been accurate and precise during the experiment.

  2. Investigating Membrane Permeability.

    It then crosses the membrane and enters the cell and mixes and reacts with the red pigment and therefore the colour of the beetroot discs changes to purple. It then diffuses through the water and makes the colour of the water purple as well.coaf afr seafafw oraf afk inaf foaf af.

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