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

Investigating a Factor affecting the rate of reaction between Sodium Thiosulphate and dilute Hydrochloric acid

Extracts from this document...


Investigating a Factor affecting the rate of reaction between Sodium Thiosulphate and dilute Hydrochloric acid Planning We have been asked to investigate the rates of a reaction and the effect different changes have on it. The rate of a reaction can be described as the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. This rate is calculated by dividing 1 by the time taken for the reaction to occur. The reaction I have been asked to investigate is: Sodium Thiosulphate + Hydrochloric Acid ? Sodium Chloride + Water + Sulphur Dioxide + Sulphur Na2 S3 O2 (aq) + 2HCl (aq) ? 2NaCl (aq) + H2O (l) + SO2 (aq) + S(s) The dilute Hydrochloric acid reacts with the Sodium Thiosulphate solution to give a precipitate of sulphur. Both liquids are clear and colourless before they react. The appearance of the insoluble sulphur during the reaction makes the mixture cloudy. The cloudiness increases as the reaction is allowed to proceed. According to the collision theory of reacting particles, there are five factors that affect the rate of a reaction: * Concentration (of solution) * Temperature * Pressure (in gases) ...read more.


I can do this by either swirling it a set number of times or not swirling it at all. I have decided to do the latter of the two, which will be easier and because if I swirled the flask a set number of times, there would be a possibility of swirling it with different forces. The stopwatch I used measured only to seconds and not any decimal places, which means that the results were not accurate enough. For my actual experiment I will use a stopwatch which measures to two decimal places. Volume of Sodium Thiosulphate (ml) Volume of Water (ml) Concentration of Solution (mol/dm3) Time taken for reaction to occur (s) Average time (s) Rate of Reaction 1 2 50 0 0.15 31.31 33.57 32.44 0.031 40 10 0.12 38.84 40.59 39.72 0.025 30 20 0.09 57.05 57.71 57.38 0.017 20 30 0.06 78.40 81.56 79.98 0.013 10 40 0.03 164.61 148.81 156.71 0.006 0 50 0.00 No reaction No reaction No reaction No reaction Results To improve the reliability of my results, we used the same person to look at the cross through the solution and decide when they could not see the cross anymore. If we hadn't done this the experiment would not have been a fair test because my partner and I have very different eye sight. ...read more.


If I did the experiment again I would repeat the experiment one more time to improve the reliability. I don't think the way we measured when the experiment had stopped was very accurate because it was very hard to tell when the cross was impossible to see anymore. So, if I was to do the experiment again I would choose a reaction which results in bubbling, so that it would be easier to tell when the experiment has come to a halt. My results are reliable as well because when I took the repeats of each concentration, they did not vary much. All of my results are consistent with each other and no results were so different that they should have been ignored. However, I could have repeated the experiment again, but I doubt that they would have changed the average very much unless they were particularly anomalous. To extend my enquiry I could investigate the rate of a different reaction using solid and a liquid instead of two liquids. This would also give me a chance to change the surface area of the solid reactant, which I could not do in this experiment. I could then look at the graphs that my results will have given me to see if they show the same trends as in this experiment. ...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. Experiment to Investigate the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate, with ...

    In my prediction I also said that the decrease in the concentration should be proportional to the decrease in the rate of reaction. The Graphs 3 and 4 show this proportionality. E.g. in the Results Table 2 when the concentration of the sodium thiosulphate is 0.15 Mol.dm-� the rate was 3.42 (X 10-�).

  2. The aim of this coursework is to investigate the rate of reaction between sodium ...

    Safety Goggles must be worn, as we will be working with acid and solutions. Hydrochloric acid is an irritant and can be corrosive. Amendment to Method During our investigation, we found that when using the pipette, the hydrochloric acid, took too long to dispense into the solution.

  1. Free essay

    Close Your Eyes

    I closed my eyes and put my head back as I felt his hands move slowly downwards and play with the hem of my knickers before slowly and pleasurably pulling them off as well. I opened my eyes to see a black g-string fly across the room.

  2. Sodium thiosulphate and hydrochloric acid Investigating how the rate of reaction is affected ...

    � The black cross � A pair of Tongs Safety Precautions: Throughout this experiment, I made sure that safety was one of my top priorities. I wore goggles at all times to protect my eyes; I had to pour the reactants out extremely carefully as hydrochloric acid is an irritant where as sodium thiosulphate poses no threat to me.

  1. Factors Affecting Enzyme Activity

    I obtained a 1cm3 syringe with which I could accurately measure to the nearest 0.02 cm3 I used 0.2cm3 of liver suspension and 5cm3 of hydrogen peroxide my results are in the table below. Time (s): 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 Amount of gas given off using 0.2cm3 of liver suspension and 1cm3 of hydrogen peroxide (cm3)

  2. Investigating the factors influencing the rate of reaction between Sodium Thiosulphate and Dilute Hydrochloric ...

    In this solution of Sodium Thiosulphate and Hydrochloric acid, there are only a few Sodium Thiosulpahte molecules to collide with the acid molecules. This means there is less chance of collisions occurring and a less probability of effective collisions occurring to form a product. This reduces the rate of reaction.

  1. Investigating the rate of chemical reaction between sodium thiosulphate solution and dilute hydrochloric acid

    Each time I will add 5cm� of 2M hydrochloric acid to the 50cm� of the stated concentration of sodium thiosulphate. To vary the concentration of the sodium thiosulphate I will use the following formula: New diluted concentration = volume of thiosulphate used x 40 50 By varying the amount of

  2. Factors Affecting the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate.

    - increasing the temperature of particles increases their amount of energy. This means they move around more and have an increased chance of colliding together and reacting. Also, by increasing the amount of energy the reactants have you increase the chance that the certain activation energy point has been reached.

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