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

Effect Of Concentration On The Rate Of Reaction between Sodium Thiosulphate & Hydrochloric Acid.

Extracts from this document...

Introduction

Name : Maged Shereen Class : 4/8 Activity : C5.01-05 Dated : 10-4-2003 Coursework Assignment Effect Of Concentration On The Rate Of Reaction between Sodium Thiosulphate & Hydrochloric Acid Rate Of Reaction Between Sodium Thiosulphate & Hydrochloric Acid I. (PLANNING( Introduction The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the reaction to take place. There are seven factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface area (of solid reactants), presence of catalysts, light intensity (for some reactions), and the nature of reagents. I have chosen to investigate the effect of concentration on the rate of reaction, because it is the most practical to investigate. It is difficult to get accurate readings due to the inevitabilities of human errors, and as gas is mostly colourless it is difficult to gauge a reaction changing the pressure. If a substance is added to give the gas colour, it may influence the outcome of the experiment. Similarly, the use of a catalyst complicates things and if used incorrectly it could change the outcome of the experiment. ...read more.

Middle

I will Leave the conical flasks for about 30 minutes before mixing the reactants reagent in order to have the same initial temperature (room temperature). I will not hold the conical flasks with your hands during the experiment to avoid heat transfer. The stopwatch will be started at the exact time as we put HCl into the conical flask. 7- Prediction I predict that as the concentration of Na2S2O3 increases, the rate of reaction will increase. I predict this, because on increasing the concentration of the reagents, there will be bigger number of colliding particles per unit volume, so there is more frequency of successful collisions, and the reaction goes faster decreasing the time needed to obscure the cross. If the concentration of Na2S2O3 doubles, I predict that the rate of reaction will also double. 8- Resources * http://www.edexcel.org.uk * http://www.essaybank.co.uk./GCSE/chemistry_coursework * Dr Nabil Sobhy, chemistry notes OL, Dar Eltarbiah, Year 2002-2003, page 118, 122,123. II. (OBTAINING EVIDENCE( Precautions (a) For personal safety ? Wear safety goggles to protect your eyes from chemical splashes. ? Taking care when handling chemicals, particularly Hydrochloric acid because it is a corrosive. (b) For accurate results ? There should be a contrast between the black cross and the white paper in order to make the cross quite obvious. ? Leave the conical flasks for about 30 minutes before mixing the reactants reagent in order to have the same initial temperature (room temperature). ...read more.

Conclusion

I do not have any anomalies results, which do not fit in the pattern because my predictions coordinated with my results very well. My method of carrying out the experiment was fairly accurate. I made sure to wash the beakers carefully for the two levels of concentration. The second experiment, I measured the same amount of solution in each time and stopped the stopwatch as soon as I observed the cross disappearing. I think that I should have used five different beakers for the five different concentrations because this would be more accurate, fair as the beakers will be dry. If I was to do the experiment again, I could improve the accuracy and reliability of the results by having a range of different concentrations. Also I could use the same amount of beakers for the number of different concentrations I used. If I had more time, I could do additional experiments to investigate another factor such as the effects of temperature on the rate of reaction. Improvements that could be made to this experiment: To repeat this experiment several times and record more averages in order to obtain a higher degree of accuracy. In my experiment, temperature and exact quantities could not be possibly obtained. On the whole, I believe this experiment was carried out to the best of my abilities, and is the optimum performance using all possible resources and time available. The results obtained, which seem reliable, supported my predictions. - 1 - 10 O.L. Chemistry 1/7 Coursework ...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 Patterns of Behaviour 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 Patterns of Behaviour essays

  1. Marked by a teacher

    Chemistry Coursework - How the concentration effects the rate of reaction between sodium thiosulphate ...

    40 206.19 0.03 0.0048 5 0 50 - 0.0 - Results of experiment 2 Vol. HCl (cm�) Vol. Sodium thiosulphate (cm�) Vol. Water (cm�) Time (seconds) Concentration (Mol.dm ) Rate of Reaction (1/Time) 5 50 0 30.25 0.15 0.033 5 40 10 41.87 0.12 0.024 5 30 20 54.61 0.09

  2. An Experiment to Investigate the Effect of Changing the Concentration of Hydrochloric Acid on ...

    My preliminary work wasn't really to see the reliability of the data obtained when I was in carrying out the practical (which can be clearly seen from my results shown below) but it was to help me decide on a range of molarites that would be suitable for the real experiment.

  1. Science Coursework

    Furthermore the highest concentration which was 50g/L took the lowest amount of time to for the laminated cross to disappear. Whereas the lowest concentration 10g/L took the longest amount of time as the graph shows the differences between the two.

  2. The effect of concentration on the activity of catalase.

    The bubbles are oxygen being evolved. Catalase is present is the perioxsomes of nearly all aerobic cells. Perioxsomes are membrane bound organelles that is the location of various oxidation reactions whereby toxic peroxides are produced as side products. Catalase's function is to protect the cells from hydrogen peroxide's damaging effects by decomposing it in to oxygen and water.

  1. To investigate the effect of varying the masses of white sugar and yeast and ...

    The rate of rising positively depended on the temperature up to 35oC after which a rise in temperature was shown to decrease the rate of rising of wheat dough. The null hypothesis stated that the rate of rising of wheat dough would be independent of the mass of white sugar, the mass of yeast and the temperature.

  2. Investigating the effect of temperature on the reaction between Sodium Thiosulphate (Na2S2O3) and Hydrochloric ...

    This could be because the apparatus was not cleaned properly after the previous experiment. However, the average time was as I expected, and so I counted all of the times in my results. For our experiments, we had to wash the apparatus out after each one.

  1. Effect Of Substrate Concentration On The Activity Of Catalase

    The 6% also gave off the most oxygen in the shortest time whereas the 1.5% concentration gave off the least oxygen in the longest time. From looking at my graph I can see that the 6% concentration had the steepest slope which if I relate back to my rates of reaction theory.

  2. An investigation into the effect of concentration on the rate of reaction. The disappearing ...

    and free of any water or any other substance before we attempt to start the next experiment - any other foreign substances could influence the outcome of the experiment. Safety Precautions There are a few safety precautions that need to be taken into consideration in this experiment.

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