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Investigating the reaction between magnesium and hydrochloric acid.

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Investigating the reaction between magnesium and hydrochloric acid. Planning I am going to investigate how changing the concentration of hydrochloric acid affects the rate of reaction between magnesium and hydrochloric acid. I will do this by changing the concentration of the acid, then observing how it affects the rate of reaction and finally writing the results down and drawing conclusions from the gathered results. Constants, fair test and safety measures I will make my experiment a fair one by using the same amount of magnesium and the same apparatus in each part of my experiment; I will also keep the same strength of hydrochloric acid (2M) and keep it at room temperature. I will also always use the same volume of liquid, this volume being 30ml. To make my experiment a safe, I will wear safety goggles throughout because I am using acid and will mop up any spillages immediately. I will also take extra care not to spill any hydrochloric acid and will keep an eye on my equipment at all times to make sure it isn't tampered with. ...read more.


Then I got the stopwatch ready and placed the piece of magnesium into the boiling tube with the acid in, as soon as the magnesium strip made contact with the acid I started the stopwatch going. I stopped the stopwatch when the magnesium strip had completely disappeared and recorded my results. I then repeated the experiment using 25ml of 2M hydrochloric acid but also added 5ml of water into the acid using the other measuring cylinder before adding the magnesium. I then repeated the experiment using different concentrations of acid and water but still kept the same volume of liquid. The concentrations will be as follows :- 30mls of acid, 25mls of acid to 5mls of water, 20mls of acid to 10mls of water, 15mls of acid to 15mls of water, 10mls of acid to 20mls of water and finally 5mls of acid to 25mls of water. Diagrams Measuring Cylinder boiling tube with acid and water in Results Table 1st try Volume of acid Volume of water Time taken for 1cm strips of magnesium to be dissolved 30ml 0ml 26.47 seconds 25ml 5ml 2 ...read more.


the more chance there is of the acid particles colliding with and destroying the magnesium atoms. Thus I have concluded that the more concentrated the acid in a solution is, the speedier the reaction. The reaction and products made by the reaction can be expressed as the equation:- Magnesium+ hydrochloric acid magnesium chloride+ hydrogen Mg(s) + 2HCL (aq) MgCl (aq) + H (g) Evaluation In general I think that my experiment went well, and that my conclusion was well proven and founded. Although the experiment went well it could have gone better and things could have gone wrong. For example measuring errors may have occurred unintentionally and when observing the magnesium dissolving I could have slightly mistimed the stopping of my stopwatch and obviously under stricter lab conditions the results would have been more accurate and better. I believe that my results were accurate apart from the one anomalous result I obtained and that if I repeated the experiment for a third times my results would be the same. ...read more.

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