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

Investigate the affects that different concentrations of sodium hydrogen carbonate on the rate of photosynthesis.

Extracts from this document...


Sc1 Investigation: Biology Aim: To investigate the affects that different concentrations of sodium hydrogen carbonate on the rate of photosynthesis. Plan: Background Research Photosynthesis Equation: Light energy & chlorophyll 6CO2 + 6H2O C6H12O6 + 6O2 Factors The resistance of a wire depends on certain factors. Some of these variables are listed below: * Light Wavelength * Carbon Dioxide (sodium hydrogen carbonated) * Temperature * Water All these factors will have to be kept constant except the concentration of sodium hydrogen carbonate to make sure that the investigation is a fair test. I have decided to investigate how the concentration of sodium hydrogen carbonate affects photosynthesis because other factors such as temperature and wavelength are hard to control or vary. I will weaken the concentration by half each time and will start at 5% and make my way down to 0.08 %. ...read more.


Risk Assessment and Safety Precautions There are not many safety precautions that need to be taken into consideration, in this experiment. The main two I can think of are stated below: * Do not get any chemicals on skin or in your mouth as this could be harmful * Make sure to keep any electrical wires from the lamp away from water, thus preventing an electrical shock Method * Collect the apparatus. * Measure 7cm of pond weed; make sure there is a clean cut for the oxygen to come out. * Put the pondweed in the boiling tube, when the boiling tube is in the rack. * Get the solution of 5% Sodium Hydrogen Carbonate (NaHCO3). Put this in the boiling tube * Put the lamp on and shine it at the boiling tube. ...read more.


This is because there is more Carbon Dioxide so the pondweed has more resources to use for photosynthesis. Evaluation I do not think that my investigation was very fair because all of the bubbles were different sizes. This made our results inaccurate because we could not measure how much Oxygen there was. The only anomalous result on my graph is the result for 5 % concentration, which is higher than all of the other results. I think this can be explained because the NaHCO3 is twice as big as the next result, which means it should be correct to stand out. My results support my prediction of the number of bubbles getting smaller as the concentration goes down. To further investigate, I could use more concentrations of NaHCO3 going even as high as 100%. ...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 Green Plants as Organisms 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 Green Plants as Organisms essays

  1. Marked by a teacher

    How the molar concentration of NaHCO3 (Sodium Hydrogen Carbonate) affects the rate of photosynthesis ...

    5 star(s)

    6. I will then count the number of bubbles that appear during thirty seconds and record it down and continue to record it for three minutes whilst glancing over from time to time to check if there has been any temperature change.

  2. Effect of Sodium Hydrogen Carbonate Concentration on the Rate of Photosynthesis

    3 (mins) 6 (mins) 9 (mins) Average Meniscus Movement (mm) Temperature (�C) 0.0100 2 1 3 2 24 0.0125 4 3 5 4 24 0.0166 8 7 6 7 25 0.0250 7 15 8 10 25 0.0500 9 18 15 14 26 0.1000 15 25 20 20 25 Analysis and Conclusion The resulting tabular and graphical evidence show some good results.

  1. How temperature affects the rate of photosynthesis.

    The optimum temperature of enzymes to work is about 37.5oC. The experiment will investigate the affect of temperature on the rate of photosynthesis and temperature affects some important stages of photosynthesis like the Calvin cycle controlled by Rubisco. A high temperature accounts for the high rate of reaction at those

  2. Experiment to investigate the effect of different concentrations of Carbon Dioxide on the rate ...

    solution of 0.5 M sodium hydrogen carbonate � Distilled water for dilution of the stock solution. In the experiment the manipulated variable will be the concentration of sodium hydrogen carbonate in the measuring cylinder, this will be controlled by reducing the amount of sodium hydrogen carbonate and then making the

  1. An investigation into the effects of different concentrations of lead chloride on the growth ...

    Although the length of the roots were not measured, observing the growth of the roots showed that the roots of the cress seeds in the cotton pad were not trapped in the pad and could be easily picked out. However, this was not the case for cotton wool in which

  2. Water and Marine Resources

    In many cases farmers have to install winter-fill storage tanks, in the form of underground storage or water tanks, in order to store water for the summer. Technological improvements in agricultural efficiency will also help, for example, by replacing spray irrigation systems with small-bore trickle-feed pipes.

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