Rate of Reaction

Preliminary results

I will gather some preliminary results to produce better final results; this will create a better accuracy in my final results as I will take my preliminary results and create a range of results where I will omit results that do not fit.

Time (minutes) Gas Produced (ml) HCl (ml) Water (ml) CaCl2 (grams)

1 25 25 0 1

1 1 20 5 1

1 0 20 5 3

1 8 10 15 1

1 45 20 5 1

1 20 15 10 1

1 25 25 0 1

1 1 5 20 1

1 8 10 15 3

1 45 15 10 1

1 20 10 15 2

By looking at these results I found that It is better to use one gram of calcium chloride as it would be wasteful to use two. The amount of acid that I am using would not react with all the calcium chloride so the acid to calcium chloride ratio I am using is fine.

That ratio being: 1 gram of CaClІ to 25 ml of HCl to water ratio.

And the time period is also suitable as the reaction is complete after around 50 seconds.

To collect my final results I will use a conical flask which is where the reaction will be taking place the conical flask will have a bail arm to a rubber tube which will be connected to a gas syringe. This will also make my results accurate as all the gas produced will be collected.

I know that the key factor that will effect the reaction will be concentration as a reaction takes place when two elements/particles collide so therefore if the acid is more concentrated there is a greater chance of the particles of HCl will collide with the CaClІ particles as there are more of them to collide in one area. From this I predict that the higher concentration the faster the reaction as particles of HCl will come into contact with particles of CaClІ quicker as there is a greater chance of it.

Having to not change the concentration of the batch of HCl I am