• 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

Rate of reaction

Extracts from this document...

Introduction

Mr. McGeorge - Blue June-July 2004 Plan Aim In my investigation I am trying to find out how concentration affects the rate of reaction. Introduction In my experiment I intend to see how long it takes for a solution of Hydrochloric acid and Sodium Thiosulphate to go cloudy. Then I will dilute the Sodium Thiosulphate by adding water. However I will keep the concentration of Hydrochloric acid the same. I will check to see how this affects my experiment. Here is the word equation for my experiment below. Sodium + Sulphuric Sodium + Sulphur + Sulphur + Water Thiosulphate Acid Sulphate Dioxide Here is the symbol equation for my experiment. Na S O + H SO Na SO +SO +S+H O I will know if my reaction is working because the water will go cloudy. Preliminary Work For my preliminary work I did my experiment at the following concentrations. Concentration of Thiosulphate (ml) Concentration of Water (ml) Amount of Hydrochloric acid (ml) 50 0 10 40 10 10 30 20 10 20 30 10 10 40 10 I did this to see if any of my concentrations were too quick or took too long. Here are my preliminary results. Concentration of Thiosulphate (ml) Concentration of Water (ml) ...read more.

Middle

To make it a fair test I will keep the amount of Hydrochloric acid the same because this is the control of the experiment. I will measure it with a small measuring cylinder because they are more accurate than the larger measuring cylinders. If I were to change the temperature then it would spoil my results because of the kinetic theory. For reliability I will repeat the test at each concentration three times then take an average of the three results. Prediction I predict that as the concentration of Sodium Thiosulphate decreases then the time taken for the solution to go cloudy will increase. I think this because if there are more Sodium Thiosulphate particles then they will have more of a chance of colliding with the particles of Hydrochloric acid so the solution will go cloudy quicker. If the Sodium Thiosulphate is diluted with water then it will take longer for the solution to go cloudy, as there will be less Sodium Thiosulphate particles to react with the Hydrochloric acid particles. I will test my prediction. Results Here are the results of my experiment. Concentration of Sodium Thiosulphate (ml) Concentration of Water (ml) Time 1 (seconds) Time 2 (seconds) Time 3 (seconds) Average time (seconds) ...read more.

Conclusion

I measured the rate of reaction by putting a cross on a piece of paper and when I could no longer see the cross because the solution was too cloudy I stopped the timer. The time on the stopwatch was the rate of reaction. To improve my experiment I could have changed the concentration of the acid. This would have improved the test because it would give me results and information about the test. The concentration I would use for the hydrochloric acid would be 20ml each time. I would do this to see how it would affect my experiment. Reliability of the Evidence My test was fair because I kept the amount of Hydrochloric acid the same throughout the experiment. This was the control of the experiment. I also controlled the independent variable, the Sodium Thiosulphate, by measuring it carefully and accurately. In my experiment I did not have any anomalous results. This is shown as my graph goes down in a curve, which is what it should do. I think that I do have enough data to get accurate results, however if I had done some more tests at different concentrations it would have made it more accurate. If I had done the same tests again I believe I would get similar results. To improve my method and the reliability of my experiment I could have used a thermometer to keep the temperature the same, because temperature affects the rate of 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 Aqueous Chemistry 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 Aqueous Chemistry essays

  1. See how long it takes for sodium Thiosulphate and hydrochloric acid to react at ...

    I made sure that I started the stopwatch as soon as I poured in the dilute hydrochloric acid to the solution and I made sure that I stopped the watch as soon as the cross was no longer visible I think that overall the experiment worked out as I had planned.

  2. My Aim is to see how concentration of acid will affect the time it ...

    11% 2cm� 8cm� 66.88 0.014 12.5% Average Results Table Volume of Hydrochloric acid (cm�) Volume of Distilled Water (cm�) Average taken for cross to disappear to 2 decimal places (seconds) Average Rate of Reaction Percentage decrease worked out from data on this table.

  1. Investigating the Effects of Increasing Copper Sulphate Solution Concentrations on the Germination of Cress ...

    This may also have dried out because I was not able to have access to clean needles to pierce the cling film for air to circulate into the seeds, so I had to use a stirring rod to pierce it.

  2. What factors affect the rate pf reaction between sodium thiosulphate and hydrochloric acid?

    maker on - Solutions of hydrochloric acid and sodium thiosulphate - Water 1. I will measure all the solutions for each experiment using a 50ml measuring cylinder. For each solution I am going to use a separate measuring cylinder so that separate solutions do not get mixed up before the experiment as this can affect the results.

  1. The action of amylase and pectinase in varying amounts when clarifying cloudy apple juice.

    However, it did seem to suggest that a larger proportion of amylase was needed for maximum clarification. I decided to repeat the experiment but this time using 20-minute time intervals with an overall time of 40 minutes. The results are show below. 20 minute time intervals Colorimeter reading (arbitrary units)

  2. Rate of Reaction between Sodium Thiosulphate and Dilute Hydrochloric acid

    out the balanced equation so I knew what the reaction would give me at the end and I used my text book: Chemistry for AQA(Heinemann) by Ann and Patrick Fullick to help me back my prediction with solid scientific knowledge.

  1. "What Affects How Quickly Sodium Thiosulphate (thio) Goes Cloudy?"

    If there are lots of acid particles and thio particles, there will be more collisions, as there is not enough space for the atoms to move around meaning that the atoms would collide more often into one another. If there were fewer thio particles and the acid particles are unchanged,

  2. Investigation to find out how the rate of reaction between sodium thiosulphate and hydrochloric ...

    Apparatus 9. Conical flask 10. Sodium thiosulphate (different concentrations) 11. Hydrochloric acid (same concentration each time) 12. Water (different concentrations) 13. Stop watch 14. Paper with black cross on it 15. Small meniscus 16. A large meniscus Method Firstly, we collected the apparatus that is listed above.

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