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

An investigation into the factors that affect The rate of reaction between Sodium Thiosulphate & Hydrochloric Acid

Extracts from this document...


An investigation into the factors that affect The rate of reaction between Sodium Thiosulphate & Hydrochloric Acid AIM: to investigate into the factors that affect the rate of reaction between Sodium Thiosulphate & Hydrochloric Acid. APPARATUS: 50ml Sodium Thiosulphate 10ml Hydrochloric 100ml conical flask distilled water Laminated paper with a x on it Measuring cylinder Stop watch Pipette DIAGRAM: ok this is more or less what my coursework was like i made quite a few changes but hey thats life. hope you find it useful and i will remember this when were at KES! PLAN: there are many factors that could change the rate of reaction- temperature of the liquids, concentration of the liquids, adding a catalyst, the size of particles if one part was a solid. I have chosen to change the concentration of Sodium Thiosulphate each time for the experiment. This is because I feel it is the easiest to do with the time and apparatus available. I am changing the concentration of Sodium Thiosulphate and not the Hydrochloric Acid because there is more volume of Sodium Thiosulphate. I will make up the concentrations of the Sodium Thiosulphate- 0.25 mol dm-3, 0.23 mol dm-3, 0.2 mol dm-3, 0.18 mol dm-3, 0.15mol dm-3, 0.13 mol dm-3 and put them in test tubes. ...read more.


ANALYSIS MY RESULTS: when you mix the clear liquids of Sodium Thiosulphate and Hydrochloric acid they react to form a yellow precipitate of sulphur. The sulphur starts to form immediately, but takes a while for there to be enough sulphur (product) to make the cloudy precipitate thick enough to hide the cross. The equation shows the reactants and products in this reaction. Na S O + 2HCl 2NaCl +SO +S +H O The graph shows a linear negative correlation showing my prediction was correct- the more concentrated the solution the quicker the reaction would occur. The more concentrated the solution of Sodium Thiosulphate the quicker the reaction occurred because there were more sodium thiosulphate particles so a bigger chance the hydrochloric will meet a particle and react. Using a lower concentration took much longer for the solutions to react than a higher concentration because the particles were more widely spread in the water so the number of collisions between the sodium thiosulphate and the hydrochloric acid were be limited. This would mean that if this experiment was being done for industrial purposes a higher concentration would be used because it reacts quicker. Although if you used a really high concentration the reaction wouldn't be very successful because there would be too much sodium thiosulphate to react with the hydrochloric acid. ...read more.


When adding the solutions together one time they might have mixed quicker than another time, this would mean that the time could be unreliable because the reaction could have started earlier. It is hard to know when the solutions have fully reacted this is why we use a piece of paper with a cross on it to time how long it takes for the precipitate to appear. To make the results more reliable you could use a logit sensor. This is a light beam that penetrates through the solution when the precipitate becomes too thick so that the light beam cant get through this time is recorded on a computer. This means that the time taken will be a lot more accurate because you don't have to rely on the peer reactions of a human. It was hard to start the stopwatch as soon as the solutions were added together. You could use the logit sensor to make it more accurate. To further develop the investigation you could investigate- How much you could increase the concentration of sodium thiosulphate without the solution becoming saturated. ? Changing the temperature- changing the temperature could help speed up the reaction because higher temperatures give the particles more energy so they move around quicker so collide with each other quicker and with more force increasing the chance of a successful reaction. ...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. How does the Temperature affect the Rate of Reaction between Sodium Thiosulphate and Acid?

    58 56 9.41 As a result of doing the trial experiments I have found out that the optimum concentration to use for our experiment is 10cm3 of sodium thiosulphate and 40cm3 of water. This is because it has the least percentage error.

  2. What factors affect the rate at which hydrochloric acid reacts with sodium thiosulphate?

    However in a concentrated solution there are more particles pact together so the chance of a successful collision occurring is very high and the more successful collisions means there will be a faster the reaction. Method I am going to measure how changing the concentration of sodium thiosulphate affects the reaction time between it and hydrochloric acid.

  1. An investigation to find out what factors affect the rate of a reaction

    When a spark from a plug compresses it, it ignites the mixture, causing it to go faster. This is because, when the reaction begins, heat is produced, and increases the rate. Temperature Therefore temperature also affects the rate of a reaction.

  2. An investigation of factors which might affect the rate of the reaction between sodium ...

    my eyes and how fast I can start and stop the watch. After I have collected my results then I can produce some graphs for my experiments, for my first experiment the graphs will be * Temperature oC against time in sec * Temperature oC against 1/T The first graph

  1. HCL and sodium thiosulphate - investigate which factors affect the rate of reaction.

    Prediction: What I predict to happen in my experiment is that when I add 2M of Hydrochloric acid into the flask with the sodium Thiosulphate, I hypothesise that the cross will disappear a lot faster than when I add 0.5M of Hydrochloric acid.

  2. Investigating what factors affect the rate of reaction Of sodium thiosulphate and hydrochloric acid.

    Laptop computer 2. Light sensor 3. 200ml beaker 4. Light box 5. Voltmeter 6. Power pack 7. Stand and clamp 8. Measuring cylinder This diagram shows how the apparatus will be set up for the experiment. This table shows the measurements that will be used in each experiment. Test No. Hydrochloric acid (ml)

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

    The concentration of Sodium Thiosulphate in the beakers will be the only factor to change in the experiment. Another thing that must be taken into consideration is that the Hydrochloric Acid and the Sodium Thiosulphate (+Water) must be poured into the conical flask simultaneously.

  2. An Investigation: Factors That Affect The Rate Of Reaction between Calcium carbonate and Hydrochloric ...

    The syringe was precise because it measured volume in 1ml divisions. We used the electronic balance to ensure the experiment is precise because the electronic balance is measured to 2 decimal places. Qe also used the stop clock as it is precise because it measured to hundredth seconds which helped

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