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

How does the concentration affect the rate of reaction?

Extracts from this document...

Introduction

Coursework: Rates of Reactions How does the concentration affect the rate of reaction? Introduction In my experiment I will be investigating the effect of varying the concentration of Sodium Thiosulphate when reacting with Hydrochloric Acid. I will be using the following reaction. + + Sulphur + Water The theory behind this experiment is that when the concentration increases the rate of the reaction increases the rate of molecular collisions. How to measure the rate of reactions I can measure this reaction by putting a piece of paper with a cross drawn on it underneath a beaker with the chemicals in and use a stopwatch to see how long it takes the solution to become to cloudy to be able to see the cross. ...read more.

Middle

I think that the concentration of the solution will affect the rate of reaction because the rate of reaction depends on how frequently the molecules in the reacting substances collide. Because there are more molecules about, the frequency of successful collisions is greater, and the reactions happen faster. Fair Test I will be trying to make this a fair test by trying to use the exact amount of the solution I need to use. I would use the same beaker every time. I could use the same cross on each experiment with by using the same colour. What Happened The solution gradually turned opaque because sulphur was made. Results Sodium Thiosulphate Water Hydrochloric Acid Time in Seconds 50 0 5 47.34 45 5 5 56.98 40 10 5 75.25 35 15 5 89.93 30 20 5 96.78 25 25 5 112.35 20 30 ...read more.

Conclusion

My results on my graph went in a negative correlation. Explaining Theses results because the higher the amount of Sodium Thiosulphate and the lower amount of water, the more successful collisions of atoms inside the solution there were. Comments I feel my results were quite accurate. My results came out in a negative correlation on a line graph. My only suspicions were that on the 1st and 2nd results, the gap between 50 Sodium Thiosulphate and 20 Sodium Thiosulphate was quite large (78seconds and 59seconds) but on the second the solutions seemed to work quicker than the other two sets of results (41seconds). Improvements I think, if I had did my work quicker, my results would have been most perfect. If I used the same cross on each paper it might have been fairer as tone of colour might have been slightly different. ...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. What factors affect the rate pf reaction between sodium thiosulphate and hydrochloric acid?

    I am going to use the 25ml cylinder to measure out my solutions because this is more accurate than the 50ml measuring cylinder. The stop watch I am using is very accurate and reliable. It can measure to a 100th of a second, but for my experiment the results do

  2. The effect of concentration on the rate of reaction of sodium thiosulphate.

    for human error as it is being judged on the basis of how accurate our eye site is. Therefore, I should get a pattern of results, which match up. VARIABLE/S: The ideas I came up with for the variable factors were: The quantity of either the acid or sodium thiosulphate-

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

    acid and 50cm � of Sodium Thiosulphate there is a higher concentration as opposed to 4cm � of Hydrochloric acid and 6cm � of water because all the water is doing is making sure that the volume remains the same each time therefore there is going to be a higher collision.

  2. How does varying the concentration of Hydrochloric Acid affect its reaction time with Sodium ...

    Pencil 1 Pair of Safety Glasses Diagram Description of the Experiment When Hydrochloric Acid and Sodium Thiosulphate are reacted together a sulphur precipitate forms. Making the solution cloudy. If therefore a black cross is placed beneath the firstly clear solution the rate of reaction can be timed by how quickly the cross visually disappears.

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