Реферат: Rates Of Reaction Essay Research Paper Rates

acid we have to make sure that even with the lowest concentration of acid we

still have an excess of acid.

The acid that we were using was 2 moles per dm2 which means that it is 0.2

moles per 100 cm2 of acid.

We need to make the reaction work to have double the amount of magnesium. The

maximum number of moles that the magnesium needed was 0.004 moles so the amount

of acid that we needed was double that so that equals 0.008 moles. As you can

see from the table below we have the acid in excess throughout the experiment.

Amount of HCl (cm3)Amount of H2O (cm3)Moles of acid. 1000

0.2 75250.15 50500.1 25750.05 The reason why we

used 0.01g of magnesium was because it was therefore easy to measure because

there was not too much, or too little. Therefore we had no problem with too

much gas.

Apparatus

This is the apparatus we used to measure the amount of H2 that was produced in

the reactions. We measured the amount of gas that was given of every two

seconds to get a good set of results. We used this apparatus with the reaction

changing the concentration, and then the temperature. To accurately measure the

amount of gas given of we used a pen and marked on the gas syringe at the time

intervals.

This is the apparatus we used to measure how long it took for the magnesium to

totally disappear. We used this apparatus in both of the experiments, changing

the temperature and the concentration of the acid to water.

Temperature.

When we did the experiment changing temperature we used both of the sets of

apparatus. To get a fair reaction we had to keep the amount of magnesium the

same and the concentration of the acid. In the experiment we used 0.1g of

magnesium and the concentration of the acid was 50cm3 of acid to 50cm3 of water.

This is because if we used 100cm3 of acid the reaction would be too fast. Still