• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9

I am going to investigate the factors that affect the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.

Extracts from this document...

Introduction

Key Stage 4? Science 1 Assessment Investigating Rate of Reaction Plan I am going to investigate the factors that affect the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid. These two react together according to the equation bellow: Sodium?????????????????Hydrochloric?????????????Sodium????????Water?????Sulphur? Thiosulphate?????????????Acid???????????????????????Chloride??????????????????????Dioxide? ??????????????????????????????Sulphur ???a?S???????Cl?????????????????aCl?????????S?????S The factors which I could investigate and that have an effect on the rate of reaction are volumes of solutions, density, temperature, concentration, the way in which you are going to view and record the rate of reaction i.e. from what angle/side and the last factor which would affect reaction is different ways of stirring the solution. The factor, which I will choose to change, is the concentration of solution. To help me carry out my main experiment, I am going to base it on my preliminary experiment. From the results of my previous experiment, I can make a prediction fro the one I'm doing now. On my preliminary I did five readings and that worked fine, but I thought that if I did it six times, I would have had a more accurate reading. Each time I was either increasing or decreasing the factors by 5, so this time I will do the same again because I think that worked. Having chosen the factor I am going to predict that as the concentration Sodium Thiosulphate increases, the time taken for the reaction decreases, which means that rate of reaction increases. I think this was because the increase in molarities means more solute in the same amount of solvent. ...read more.

Middle

because the mixture wasn't as diluted and a lot slower by the end of it, when most of the mixture was water which is very un-reactive. Conclusion From the graph it can be seen that as the volume of Sodium Thiosulphate decreases i.e. the concentration of Na S O decreases, the time taken for the reaction increases, which means that the rate of reaction decreases. My prediction was correct as this is exactly what I said would happen, because as we increased molarities we increased the collision effect and the rate of reaction with it. Now since rate of reaction is amount of sulphur produced divided by time then, if the amount of sulphur stays the same i.e. enough to produce the colour change then the rate of reaction can be judged by taking values of 1/time. Since the amount of sulphur is same in each experiment ( i.e. the amount needed to make a clear colour to cloudy) then Rate of Reaction = Constant / Time Taken Rate of reaction is proportional to the recepireal of the time taken. Therefore a graph can be drawn of rate of reaction (1/time taken) against concentration ( judged by volume of Sodium Thiosulphate). Concentration of Volume of Na S O Sodium Thiosulphate Total Volume of Solution Total volume is always 40 cm , so it has a constant volume. Therefore concentration of Sodium Thiosulphate is the volume of Na S O Constant So concentration of Sodium Thiosluphate is proportional to the volume of Sodium Thiosulphate. ...read more.

Conclusion

This time I will stir the solution a bit and with constant strength. I will also keep the concentration of solution the same. The only thing that I will be changing this time is the temperature. In this experiment I am going to observe the colour change when all the reactants have been added together and note down the rate of reaction. I will make only 5 measurements this time, because 6 didn't really make much difference. First I will get all solutions ready and set up the apparatus. This time I will need a Bunsen burner as well as tripod and safety mat. I will measure the starting temperature and then add on 5� with each run. The first run I will do without heating up the mixture because it will be at room temperature, but then I will heat it up and will have thermometer in the conical flask so that I will be able to tell when it reached the next set temperature. I will have the cross on the side of the flask away from the fire, so that it doesn't go up in flames ( safety precaution). Last time the cross was underneath the flask but it can't be this time. I am going to wait for the mixture to go opaque. I will start the stop - clock as soon as I put the last drops of everything in and the temperature is at what it should be. When I have obtained all of my results I will then plot them on the graph. This is now the plan of the experiment which would provide additional relevant evidence towards my conclusion. Diana Rough 11L1 ...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)

    I measured it at 30-second intervals to see how long the reaction took. My results were: Time (seconds) Mass (g) 0 109.51 30 109.44 60 109.37 90 109.32 120 109.31 150 109.30 180 109.30 I felt there was not a sufficient difference in mass (only 0.21g)

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

    no amount of sodium thiosulphate present, so that there was only hydrochloric acid and water in the conical flask, a reaction did not take place and so the time and rate of the reaction was infinite. This part of the experiment was conducted as a control to show that when

  1. How does the Temperature affect the Rate of Reaction between Sodium Thiosulphate and Acid?

    After the temperature reached our target it was then taken off the tripod and put onto our piece of paper which had a cross marked on it. 5) 5cm3 of hydrochloric acid was then added to our solution of sodium thiosulphate and water and the stopwatch was immediately started.

  2. How does the Temperature affect the rate of the reaction between Sodium Thiosulphate and ...

    Pour the sodium disulphate into the same beaker as the distilled water. 3. Heat the solution to 30 degrees Celsius using a Bunsen burner Place a pertri dish on top of the beaker to stop the solution evaporating out of the beaker.

  1. Find out how the rate of hydrolysis of an organic halogen compound depends on ...

    They can be either negative ions like OH- or molecules with a lone pair of electrons available for bonding, for example, H2O and NH3. Table 5 shows some common nucleophiles. Table 5 The carbon atom attacked by the nucleophile may be part of a carbocation and carry a full positive

  2. An Investigation into the Factors that Effect the Rate of Reaction Between Hydrochloric Acid ...

    *- Surface Area - The greater the surface area of the reactants the more particles are available for a successful collision. *- A Catalyst - A catalyst is a substance that changes the rate of a chemical reaction but remains chemically unchanged itself.

  1. To investigate the factors that affect rate of reaction.

    If two slow moving molecules collide they will just bounce apart. To meet with sufficient energy for bonds to be broken and reformed, the molecules must be moving quickly. An increase in temperature will increase the kinetic energy of the molecules and will increase the rate of reaction, as a

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

    I will try and control these as far as possible, and be as accurate as I can when measuring out the chemicals. Also if I did vary the volume of hydrochloric acid, I would have different rates of reactions , and there would be no reason for it because I am varying the ratio of sodium thiosulphate to water.

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