The aim of this experiment is to find out how different concentrations of Hydrochloric Acid and Distilled water affect the rate of reaction between Hydrochloric Acid and Magnesium.

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Chemistry Coursework

Aim – The aim of this experiment is to find out how different concentrations of Hydrochloric Acid and Distilled water affect the rate of reaction between Hydrochloric Acid and Magnesium.

Plan

Method

         In the reaction between hydrochloric acid and magnesium ribbon, the hydrochloric acid will dissolve the magnesium and produce hydrogen gas. In my experiment I am going to measure the amount of gas given off with different concentrations of hydrochloric acid and distilled water reacting with a 10cm length of magnesium ribbon

 The chemical reaction takes place when the magnesium ribbon comes into contact with the hydrochloric acid. The products that are formed during this reaction are hydrogen gas and magnesium chloride. The formula equation for this experiment is: 

                       2Mg(s) + 2HCl(aq)              2MgCl2 + H2

Magnesium + Hydrochloric acid                Magnesium Chloride + Hydrogen

          I used five different concentrations which were 1 mole/dm3, 0.8 mole/dm3, 0.6 mole/dm3, 0.4 mole/dm3, and 0.2 mole/dm3. I put the hydrochloric acid and distilled water mixture into a conical flask and add the magnesium ribbon. Next I sealed the conical flask with a rubber bung which had connected to it a tube which went to the gas syringe. Every ten seconds I measured the amount of gas given off by the magnesium and hydrochloric acid and recorded them. I did each concentration of hydrochloric acid and distilled water three times to get an average. An average will decrease the likelihood of getting any anomalous results. I will plot my results on a graph which will enable me to single out any anomalous results which I will be able to explain. . I have drawn up a table so it is easy for me to show how I produced the different concentrations of hydrochloric acid and distilled water.

          I will try and control the safety factors to minimise the risk of an accident around my workstation: such as no running in the laboratory, safety goggles

Secondary Source Work

         During this investigation I will research in textbooks, revision aids and the Internet for information to find out about rates of reaction. These sources will also back up my prediction which is explained later in this investigation.

Apparatus

         I used the following instruments to obtain my results:

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  • Gas Syringe (100 cm 3)
  • Rubber Tube
  • Conical flask
  • Measuring Cylinders (30ml) (x2)
  • Measuring Beaker (250ml) (x2)
  • Clamp Stand
  • Stop Watch
  • Syringe (20ml). This is to get as accurate results as possible.
  • Scissors

I have carefully selected these instruments to enable myself to acquire the most optimum set of results possible.

Diagram

Key Factors And Variables

         

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