• 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 ...

    The experiment must not be left unsupervised the whole way through as this could lead to vandalism or risk of fire etc. It is also sensible to ask the supervising teacher to pour out the hydrochloric acid as it is corrosive.

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

    * Keep bags and stools under the bench to allow a better and safer working environment. * Stand at all times when conducting the experiment to reduce the risk of tripping and spilling chemicals. * Take care when using the chemicals and equipment during the experiment - especially the hydrochloric acid as it can irritate the skin upon contact.

  2. Free essay

    Close Your Eyes

    *Carrie* I couldn't just leave her. She was sitting on her own, with no-one around her and now she was crying. It must be awful. To be new I mean. Ok I'm going over. I headed in her direction and once I'd reached her table I placed an arm around her shoulder.

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

    Rates of rising of wheat dough for the different masses of yeast: Mass of yeast/mg 0 2000 4000 6000 8000 1000 Rate of rising of dough/ ml/sec 0 0.023 0.038 0.05 0.065 0.071 The graph of rate of rising of wheat dough against mass of yeast had an overall positive gradient: the rate increased as the mass of yeast increased.

  2. Effect Of Substrate Concentration On The Activity Of Catalase

    This graph shows that the enzyme activity reacts best at pH7 (neutral) Concentration - In concentrated solution there are more collisions between each particle, so the reaction occurs more quickly. This graph shows that increasing the concentration increases the enzyme activity.

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

    Apparatus with justification: 1. Potato peeler --> Will be used to remove the skin of the potato. 2. Knife -->Will be used to cut the potato into cubes of the necessary quantity needed. 3. Ruler -->Will be used to measure a cm3 for each potato cube.

  2. What factors effect the rate of a chemical reaction?

    The reaction rate, however, should decrease as the experiment progresses because as the reaction time increases the number of hydrochloric acid molecules present will decrease as they have been reacted to form water calcium chloride and carbon dioxide. The additional water and calcium chloride present as the experiment progresses should decrease the rate of reaction because of decrease in concentration.

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