Reaction (rate) between magnesium ribbon and hydrochloric acid

2295 Words Jun 14th, 2004 10 Pages
Aim

It is to tell how the reaction between magnesium and hydrochloric acid will be effected if we change the concentration of hydrochloric acid.

Introduction

In the experiment the magnesium reacts with the hydrochloric acid to create magnesium chloride and hydrogen. The balanced formula for this is:

Mg(s) + 2HCL(aq) MgCl2(aq) + H2(g)

Magnesium + hydrochloric acid Magnesium Chloride + Hydrogen

Magnesium will react with hydrochloric acid, because it is higher in the reactivity series than hydrogen. The magnesium displaces the hydrogen in the acid, so it forms magnesium chloride and hydrogen gas.

There are many variables that I can change, which are the temperature and concentration of the hydrochloric acid, and the mass and the
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The amount of hydrogen I will end up with when the reaction has completely finished will be the same for all the concentrations, but if a reaction is too slow and exceeds the set time I will stop taking results and it might not finish reacting.

Preliminary experiment

I was suggested to use 20cm3 of hydrochloric acid and 5cm of cleaned magnesium ribbon, and take the volume of hydrogen in the syringe every 10 seconds for the preliminary experiment to. I tried this but the reaction happened very quickly and the results of the volume of hydrogen were very spread out. The results for each 10 second interval were not accurate enough and there was not enough magnesium to get a high level of hydrogen. To solve this I increased the amount of magnesium strip to 8cm, and decreased the time interval to 5 seconds each. I tried this and the results were much more reliable to use and analyze.

Fair Test

To keep a fair test I will have to look into all the variables surrounding the experiment and only change the variable that I am testing on. The other variables are the temperature of the acid at the beginning, the volume of acid, the surface area of the magnesium strip, the length of the magnesium strip and if the magnesium strip is cleaned or not.

The magnesium strips were cleaned and cut correctly by the lab technician and I measured and inspected the strip each time I started the experiment to make sure it was ok for the experiment. Most of these variables
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