The Effect of Catalyst an the Rate Of Reaction

The Effect of Catalyst an the Rate Of Reaction

Chemistry Coursework

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) à Hydrogen(g) + Zinc Sulphate(aq)

Symbol Equation

Zn + H2SO4 à H + ZnSO4

This reaction is catalysed by Copper sulphate (CuSO4)

Ionic Equation - Cancel Spectator ion (SO42-)

Zn + 2H+ à 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.

* Hydrogen is explosive when mixed with oxygen and burnt; so don't use a Bunsen burner near the experiment.

Method

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First a clamp stand was taken and a gas cyringe was fitted so that when it is connected to a conicle flask the conicle flask will touch the bench. 1 gram of zinc was taken along with 2M sulphuric acid and distilled sollutions. The solutions were mixed to form 1 M acid and a certain number of dfrops of catalyst wes added in the conicle flask and the...

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...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.