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What factors affect the volume of gas produced when magnesium reacts with an acid

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Introduction

Chemistry Coursework: "What factors affect the volume of gas produced when magnesium reacts with an acid" Introduction We are investigating the reaction of magnesium and hydrochloric acid: Mg + 2HCl MgCl2 + H2 The dependent variable will be the amount of hydrogen collected, the gas in the reaction. There are many independent variables I could use for this experiment: But the variable I will choose is length of Mg. I think this will definitely be the easiest to vary, as it is simply a case of cutting different lengths. It is a good one to choose also because it is almost certain that the reaction will be different at different lengths. Whereas with variables such as 'Temperature of room', 'Atmospheric pressure' etc, it could be difficult to do the experiment and also know that it is changing in order to form a sensible conclusion Hypothesis If I double the mass of Mg, it will double the volume of gas produced. The equation above shows us the molar ratio between Mg : H2 is 1 : 1. ...read more.

Middle

2. Fill test tube with 10 ml HCl and place in water full beaker. 3. Place ignition tube containing measured Mg piece inside test tube, avoiding Mg contacting HCl. 4. Set up rest of experiment as shown on diagram. 5. When experiment ready, tip test tube to side quickly, letting HCl to flow into the ignition tube, reacting with the Mg piece, then put back in water. 6. When fuzzing finished, record how much gas has collected at the top of the graduated gas collection tube. You can tell by how much water has been removed. 7. Repeat with different lengths Results Length of Mg (cm) Volume of H2 collected (cm3) 1st try 2nd try Average 0.5 15.20 14.40 14.80 1.0 18.40 16.20 17.30 1.5 23.90 20.80 22.35 2.0 28.50 28.60 28.55 2.5 30.70 31.90 36.90 3.0 41.40 43.10 42.10 3.5 47.50 48.20 47.85 Graph On separate graph sheet Conclusion The best-fit line shows that as the independent variable (length of Mg) ...read more.

Conclusion

Firm conclusion > The data is very reliable - all points lie on the line. > We have 7 readings, more than required to form a firm conclusion. > No other line could fit the points. Suitability of procedure > Range and spacing was suitable at o.5cm intervals. > We repeated the Expt and took averages. > The apparatus and method we used gave good results, coinciding with my prediction. > We could control all variables to a reasonable degree of accuracy without difficulty or setbacks. Improvements > We could have used a different set of apparatus, but using the same things, to make sure all the apparatus we used was fine. > We could have used more measurements, but as we couldn't use more than 4cm of Mg, and we generated good results twice, I don't think it would be necessary. > We could have been more precise in out measurement-taking in the experiment, but again the results we had were fine. > Our method was good and efficient. > > > > Jonathan Ewles ...read more.

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