• 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 ...

    A conical flask will be used to place the solutions into and then commence the experiment. Under the conical flask will be a piece of card with a large X on it. I will then fill the 100cm� beaker with the hydrochloric acid so that I have sufficient amounts of

  2. Free essay

    Close Your Eyes

    You do realise she's only 16 right mate?" Harry replied turning to me. "Yer, of course I do, but if its gonna work out, age won't matter" I replied. Harry lifted one eyebrow and stared at me. I laughed and then sat down next to Dougie who of course had to crush my happiness.

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

    Temperature gives energy to the particles. This allows them to move faster which results in more collisions, and gives the collisions greater energy. Temperature also provides the particles with the energy needed to start reacting. This is called the activation energy. I predicted that the increase in temperature would increase the rate of reaction, and my results agree with my prediction.

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

    watch starts and when its ends, for different people have different eyes. So in this case I will make sure that the same person records the time for each individual test. Also, the person timing the experiment will look for the disappearance of the cross, otherwise there would be a

  1. Experiment to Investigate the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate, with ...

    thiosulphate was 0.15 Mol.dm-� the rate of reaction for Graph 3 is 5.80 (X 10-�) but for Graph 4the rate is 3.60 (X 10-�) at the same concentration. This occurs throughout all the concentrations: at 0.06 Mol.dm-� for Graph 3the rate is 1.60 (X 10-�)

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

    In this experiment I will try to keep the solution at a constant temperature. Although I cannot control this entirely I will do my best to make sure that the temperature is roughly the same. The temperature I will use will be room temperature about 20�C.

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

    NADH is a molecule that supplies the activation energy needed to turn the nourishment needed for life into energy. Nourishment is things such as glucose from digested food and oxygen. The energy formed is then used for respiration. NADH is obtained from your diet.

  2. Effect Of Substrate Concentration On The Activity Of Catalase

    Fair testing: While conducting the experiment, it has to be taken into account that a few variables will have to be controlled so as to ensure that the test is fair. 1. The PH of the reactants should be kept constant.

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