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

Find out will concentration of a solution affect the rates of the reaction. As a best way of doing it, I am going to use hydrochloric acid and sodium thiosulphate to react with each other.

Extracts from this document...


Planning: My aim of the coursework is to find out will concentration of a solution affect the rates of the reaction. As a best way of doing it, I am going to use hydrochloric acid and sodium thiosulphate to react with each other. Sodium thiosulphate + hydrochloric acid ---> sodium chloride + sulphur+ sulphur dioxide + water Na2S2O2(aq) + 2HCL(aq) ---> 2Nacl(aq) + S(s) + SO2(g) + H2O(I) The apparatus I am going to use will be: -Sodium thiosulphate -Hydrochloric acid -Stop Clock -Measuring Cylinder -Conical Flask -Thermometer -Paper (with cross drawing over) What I am going to do is to use the product sulphur and measure how long it takes for the cross disappear by increasing its concentration. I am going to do that in this order: -Put 20ml of hydrochloric acid in a conical flask under a cross -Put 20ml of Sodium Thiosulphate in the same flask -Mix them in a conical flask -Take the amount of time when u can't see the cross using the stop clock -Check the temperature of the solution, are they endothermic or exothermic? -Write the results down in my results table -Repeat your experiment using a different molar To keep the whole experiment safe, I need to put goggles on whatever I am doing, because I am working with chemicals, also I need to wash our hands before we do everything. ...read more.


do it, you only need to mix 2 or 3 types of solution together and take the time to find out the results and prove the theory I predicted, also it's not dangerous in case there is an accident. Resources used: Thinking Chemistry by Michael Lewis and Guy Walker Oxford University Press Obtaining Evidence: I have got my results of the real experiment safely. These are the results I got: Sodium Thiosulphate(ml) 20 18 16 14 12 10 Water(ml) 0 2 4 6 8 10 Acid(ml) 20 20 20 20 20 20 Concentration(M) 1M 0.9M 0.8M 0.7M 0.6M 0.5M Time(s) -1st Time 26.38 26.84 35.12 38.52 50.50 58.00 Time(s) -2nd Time 26.25 29.10 35.78 40.15 49.94 60.63 Average Time (s) 26.32 27.97 35.45 38.34 50.22 59.32 I have done it in 6 different concentrations, so that I can have enough evidence and range to proof my prediction, I also done it twice to make sure I won't get anything wrong before I try to proof my prediction, this can also help me to write a conclusion about it. I think the results are reliable and accurate enough to proof my prediction later on, although it is difficult to keep everything accurate, but I think I have tried to use the help of equipment in order to keep everything as accurate as possible. ...read more.


But I am confident enough that my results are accurate enough to prove my prediction. The results are not that accurate, so I found out a few points for why it will not be accurate: -I don't know exactly when to start -I can't tell when to end -Amount of solutions maybe not accurate -Time accuracy may not be good enough -Solutions maybe contaminated To support my conclusion, I think the results and the graph will support my conclusion, they also show the scientific evidence of hydrochloric acid react with sodium thiosulphate. To improve, I will try and do the whole experiment again, with 2 different elements to react, e.g. magnesium and sulphuric acid, because they can react easily and range, so that I can see the pattern or sequence in it. But if I am trying to improve in this experiment, I will do these few things: -Measure the amount of solution using an electronic measurement -Or else use a computer to time or take the results, so that it will be more accurate -Do the experiment in a wider range of concentration; see if there will be any thing strange or different about it I will these few points can help me improve if I can do this again. Chemistry Coursework: Joseph Fisher Does concentration affect the rate of reaction? 1 ...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

    In this project I am going to investigate rates of reaction of an indigestion ...

    3 star(s)

    These readings would have been either five or 10�C apart and would have ranged from approximately 10�C to 50�C. During the preliminary experiments I investigated this further (see page 8), and revised this original method. However, I did realise beforehand that there were several different ways I could get temperatures of 50�C.

  2. How does the concentration of sodium thiosulphate solution affect the rate of its reaction ...

    0.04 mol/dm3 = 20cm3 sodium thiosulphate solution, 30cm3 distilled water. 7. 0.03 mol/dm3 = 15cm3 sodium thiosulphate solution, 35cm3 distilled water. 8. 0.02 mol/dm3 = 10cm3 sodium thiosulphate solution, 40cm3 distilled water. Observations Volume of sodium thiosulphate solution (cm3)

  1. Exothermic and endothermic reactions

    This is because when the rock was formed the squashing forces caused all the particles to line up in the same direction. Processes in the rock cycle Rocks can be broken down by the processes of physical weathering and chemical weathering.

  2. Titrations. For my science coursework I have been asked to carry out an experiment ...

    Pour one test tube full of the Sodium Hydroxide into a beaker. 2. Add few drops of indicator to turn it pink. 3. Add little amounts of HCl from the test tubes, into the solution and wait until it turned colourless.

  1. Investigation exploring rates of reaction, using the reaction between sodium thiosulphate and hydrochloric acid ...

    Stoichiometry ...is all about the amounts of substances involved in a reaction (the reactants and products). For example: C(s)+O2(g) --> CO2(g) In this reaction of coal with oxygen, for example in a barbecue, 1 mole of carbon atoms reacts with one mole of oxygen atoms to produce 1 mole of carbon dioxide molecules.

  2. 'How does the concentration of Sodium thiosulphate solution affect the rate of its reaction ...

    I shall try to make sure that the temperature stays the same throughout the experiment as, if the temperature of the solution increases, the particles in the solution move around faster and the chances of a collision become higher, so it would not be fair.

  1. I am going to carry out an investigation to find out how concentration would ...

    This means the particles around it in the solution will have more area to work on so there will be more useful collisions. If the sold particles is not broken up into smaller pieces then this would mean that the particles around it will have less area to work on

  2. How Does The Concentration Of Sodium Thiosulfate Affect The Rate Of This Reaction?

    The results show that as the concentration of sodium thiosulphate increases the time taken decreases, therefore the rate of reaction increases. This is because if there is less water, the solution is more concentrated. The more concentrated the solution, the quicker the precipitate will form, (faster rate of reaction), and vice versa.

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