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Does The Number of Drops of Catalyst Effect The Rate Of Reaction

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Introduction

Does The Number of Drops of Catalyst Effect The Rate Of Reaction Candidate Name: Ben Dodds Candidate Number: 7158 School: Oundle School Completion Date: Introduction We are studying the reaction between zinc and sulphuric acid, the reaction is catalysed by copper sulphate and this experiment is to test whether the amount of drops effect the rate of reaction. Word Equation Zinc(s) + Sulphuric acid(aq) --> Hydrogen(g) + Zinc Sulphate(aq) Symbol Equation Zn + H2SO4 --> H + ZnSO4 This reaction is catalysed by Copper sulphate (CuSO4) Ionic Equation - Cancel Spectator ion (SO42-) Zn + 2H+ --> Zn2+ + H2 For this reaction to work there must be hard collisions between the zinc and the hydrogen ions (acidity ion) from the acid, The faster the harder and the more often the collisions happen so I predict the more catalyst the faster the reaction. Planning Safety * Sulphuric acid at 2M is a corrosive substance but diluted to 1M it is an Irritant, so wear a Lab coat to protect your cloths and wear safety specs to protect your eyes. * Zinc is very flammable so do not put a Bunsen burner near it. * Copper sulphate is very nasty and corrosive when it gets in your eyes so wear safety specs. ...read more.

Middle

I will measure the time it takes to collect 20 cm3 of hydrogen and I will use a gas syringe to collect the hydrogen. I will use the number of drops of catalyst as stated in the 'Names and Quantities' section and a teat pipette will be used to measure out the drops, it must be the same pipette as all pipettes give different drop sizes so to remain constant use the same teat pipette. I will mix the distilled water and the acid in a measuring cylinder. What I will do to ensure my results are reliable I will do the same experiment three times so the results are accurate and if I get an odd result the others will balance it out, in the end I will use the average. I will always use the same apparatus so everything is kept constant. Results for Pilot experiment No. Of drops of catalyst Time to produce 20 cm3 of hydrogen (secs) 1 89 15 28 25 25 30 25 In the real experiment I will work out the rate of reaction, to do this I will: 1 1 /sec or /s-1 Time secs This is valid: Amount of product =20cm3 of gas which is constant Time time Rate = 20 1 Time Time = Inversly proportional to time Obtaining Evedence Table Of Results No. ...read more.

Conclusion

What Caused The Anomalous result? I think the anomalous result was caused by the facts listed above, the temperature, pressure, amount of zincand the amount of copper sulphate were not kept constant. Did I do enough readings I think I have done enough readings as the trend of my predictions were there but I could have done a greater range. The only problem with that is I would have to dilute the acid again as the times were very quick for 15 seconds so it would be to awkward to collect if I did 30 drops of copper suphate it would have been to quick to record. Could your results lead to any findings outside the range of results covered? Yes I could as my graph is a straight line graph so I could extend it and look at maybe 40 or 50 drops and look at what the rate is for them What additional relevant work could you do to extend your theory? We chose to vary the amount of drops of catalyst but what you could vary is maybe whether the temperature, pressure, concentration of the acid or amount of zinc. Ben Dodds Thursday, 03 May 2007 Chemistry Coursework Page 1 ...read more.

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