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The effect of concentration and the rate of reaction between Sodium Thiosulphate and Dilute Hydrochloric Acid.

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Introduction

The Effect of Concentration and the Rate of Reaction between Sodium Thiosulphate and Dilute Hydrochloric Acid Introduction I am going to be investigating the effect of concentration and rate of reaction between sodium thiosulphate (NA) and dilute hydrochloric acid (HCI). Rate is a measure of how fast or slow something happens e.g. a plane flew 2000km in 1 hour therefore; it flew at a rate of 2000km/hr. There are five main factors that affect the rate of reaction: > Catalyst > Concentration > Temperature > Surface Area > Pressure/Light Catalyst: When a catalyst is added to a reaction it changes the rate and makes the reaction happen faster most of the time. When a catalyst is added it breaks the bonds in the reactant and makes new bonds, as the particles are now smaller there is less resistance and therefore the particles move faster or have a bigger surface area exposed so the acid can make contact and react. ...read more.

Middle

Surface Area: When a large object is cut into smaller pieces the surface area increases, as more of it is getting exposed to the air. This would be the same case for a reaction e.g. magnesium and hydrochloric acid. As more atoms are exposed the acid can react with more of the object so the reaction will become quicker. Pressure/Light: The increase in pressure forces the particles closer together. This causes collisions and an increased rate of reaction. If there was bright light photosynthesis, for example, would be very fast and the plant will give out more oxygen. In night there no light so photosynthesis will not occur and oxygen will not be produced. Prediction I think that the higher the concentration of sodium thiosulphate then the faster the reaction will take place. This is because of the collision theory. Higher concentration with a higher density of particles causes more particles of reactants to collide with sufficient activation energy. ...read more.

Conclusion

When the black cross wasn't visible anymore, I clicked "Stop" on the stopwatch and recorded the time. Results Sodium Thiosulphate (cm3) Water (cm3) Hydrochloric Acid (cm3) Time Taken (seconds) 10 40 10 274 20 30 10 129 30 20 10 69 40 10 10 54 50 0 10 39 Evaluation I thought that the experiment went well. Everything went according to my plan. The procedure that I used I thought was appropriate and the correct equipment was used. I thought that I got these results because of what I explained in my prediction, collision theory. Conclusion I thought that my original prediction was correct. I thought that I got these results because of collision theory. There are more particles to collide with each other so the colour change was much quicker. The experiment was as fair as I could make it. I could have improved the experiment by using data logging equipment as this would have produced more accurate results and the test would have been fairer. If I was to improve my experiment I would use more precise equipment as the human eye is not very reliable. Graph Anthony Fayal Science Coursework 07/05/2007 Page 1 of 4 ...read more.

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