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

What affects the rate of reaction between Sodium thiosulphate and Hydrochloric acid?

Extracts from this document...


What affects the rate of reaction between Sodium thiosulphate and Hydrochloric acid? Prediction I predict that the more concentrated the acid the faster the rate of reaction. Theory to back up my prediction Particle theory tells us that the more particles the more frequent successful collisions there will be. When the concentration of the acid is increased the rate of reaction increases because of more successful collisions. Low concentrated acid High concentrated acid Variables: Catalyst Concentration Temperature Plan In this experiment I am going to investigate what affects the rate of reaction between sodium thiosulphate and hydrochloric acid. A chemical reaction can only happen if the molecules frequently and successfully collide into each other. These molecules have to hit each other in the right direction and at the right speed and with the right amount of energy. Apparatus * 500ml Beaker * Stopwatch-- So I can accurately time the rate of a reaction to 1/100th of a second. ...read more.


Start timing when all the sodium thiosulphate has been poured into the beaker. 6. Wash the beaker thoroughly and repeat steps 2-5 another two times. 7. Repeat steps 2-5 with different with different hydrochloric acid molar strengths : Molar Strength Volume of Hyrochloric Acid in (ml) Amount of Water Added (ml) 2 50 0 1.60 40 10 1.20 30 20 1 25 25 0.80 20 30 Results Table Volume of Hydrochloric Acid 2 molar Volume of Sodium Thiosulphate Molar Strength of Hydrochloric Acid R.O.R Time (Sec) Water (ml) pure Average Total Volume Fair Test * I will use separate measuring cylinders for both chemicals so I don't contaminate either of them until I'm ready to time the reaction. * I will not use a catalyst in the experiment. * I will not increase the temperature of the liquids, and the area which I shall be working in will be kept constant at room temperature(22oC) ...read more.


Looking at graph A you can see that there is a positive correlation between the concentration of hydrochloric acid and the reaction rate. When hydrochloric acid and thiosulphate react together the sulphur is stronger of the two. This means that as the reaction goes on the solution becomes yellow and will change from being transparent to translucent to opaque. The more concentrated the acid the more particles there are which means the more collisions. On my graph, the line of best fit shows that the time taken for the reaction between hydrochloric acid and sodium thiosulphate is proportional to the concentration of the hydrochloric acid. Evaluation I think that my results were fairly accurate, as there wasn't any anomalous points. If I were to repeat this experiments I think that I could improve my results even more by * I don't think there was a large enough range of results taken so I would Increase the number of experiments another twice for each category * Repeat experiment but with a different person to judge when the reaction has finished. ...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?

    This is because as the concentration of sodium thiosulphate doubles there are double the number of particles of sodium thiosulphate; this doubles the chances of a successful collision between sodium thiosulphate particles and hydrochloric acid so therefore the reaction rate is doubled.

  2. How the effect of concentration affects the rate of a chemical reaction

    At the end of a reaction, the catalyst is chemically unchanged .A catalyst works by lowering the activation energy needed for the experiment to start. Preliminary Experiment Report When testing 2 M Hydrochloric acid the magnesium reacted so violently with it that the Magnesium ribbon jumped out of the Hydrochloric acid and stuck to the side of the beaker.

  1. to investigate how the concentration affects the rate of the reaction

    the reaction increases until it reaches a point where it cannot go any faster. I have decided to leave the surface area and temperature the same and unchanged. I am going to be changing the concentration in my experiment because the change in concentration allows me to find out how

  2. Investigating what affects the rate of reaction between sodium thiosulphate and hydrochloric acid

    correlate with the rate of reaction - that is, the more hydrochloric acid, the faster it would take for the cross to disappear. I think this because the more acid within the solution, the more meaningful collisions would take place.

  1. How Concentration of Acid affects rate of reaction.

    If the chips weighed .4g (the smaller ones) it would mean another could be added to the tray and the mass would only be 0.1g away.) I also chose the 2-4mm size as the bigger chips reacted too slowly (as they had a lower surface area : mass ratio)

  2. This experiment will show how the temperature and concentration affects the rate of reaction ...

    The graphs below show ideal results, which I would like to obtain from this experiment. I do however recognize that my results will not match these entirely. Due to human error and the circumstances I am working in, these are ideals.

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