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

Rates of reaction when decolourising acified potassium permanganate.

Extracts from this document...

Introduction

Chemistry investigation: Rates of reaction when decolourising acified potassium permanganate. Introduction Over a period of several lessons, we planned an executed an experiment, so as to investigate what variables affect the rate of reaction when decolourising acified potassium permanganate with glucose. It would be easy to tell when the reaction has finished because we would be left with a colourless solution. There are only two feasible variables with which we are conducting the experiment that can be changed. These are the temperature at which the reaction takes place and the concentration of glucose used to react the substances. For the duration of this particular experiment I chose to change the concentration of glucose. Prediction My prediction is that the higher the concentration of glucose present in the experiment the faster the reaction will take place. ...read more.

Middle

From the second the last syringe of glucose is added to the solution in the last test tube the timer must be started. The time must be measured for each tube to turn colourless. From this it will become apparent whether the prediction was correct. A table of results must be drawn to finalise this prediction. To keep the experiment fair, the same amount of potassium permanganate should be placed in each tube and the same amount of sulphuric acid as well. The only variable in the experiment is the concentration of glucose-water solution. The experiment should be conducted at room temperature. Results Tube # Result Potassium Permanganate (cm�) Glucose (cm�) Water (cm�) Time (S) 1 Yes 2 1 9 249 2 Yes 2 2 8 223 3 Yes 2 3 7 208 4 Yes 2 4 6 167 5 Yes 2 5 5 140 ...read more.

Conclusion

Also the meniscus effect on the water level must be taken into account. Tension on the surface of the water causes it to magnetically attract to the sides of test tubes and syringes making it difficult to measure the exact water level. Also if the syringe is not viewed at eye level then the actual amount measured can differ by up to 1 cm�. Also it is hard to say exactly when the solution has gone completely colourless. If the experiment could be done again with more accurate equipment then the results could possibly be very different. If there was some way to measure the amount of light that passes through the solution, then it would be easier to tell when the solution had gone completely colourless. There were no anomalous results in this experiment, though that may be due to inadequate equipment. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction 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 AS and A Level Exchange, Transport & Reproduction essays

  1. Investigation into rates of reaction decolourising acidified potassium permanganate with glucose.

    To test the different concentration theory, one tube, 1cm� of glucose and 9cm� of water will be added, the next 2cm� to 8cm�, then 3cm� to 7cm� and so on until it has reached 10cm� to 0cm�. The experiment is being strictly timed so from the very second the last

  2. This experiment aims to investigate the effects of 4 different types of fish food ...

    All fry tanks would be kept in the same room under the same conditions. Room temperature is kept at a constant 21?, although if there are any variations in temperature would affect all fry, which would prevent validity issues at the expense of reliability.

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