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The aim was to become accustomed to working with the equipment and to find optimum levels of hydrochloric acid and magnesium ribbon to produce 60cm of hydrogen, a sensible amount to produce in the real experiment.

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Introduction

Aim: The aim was to become accustomed to working with the equipment and to find optimum levels of hydrochloric acid and magnesium ribbon to produce 60cm of hydrogen, a sensible amount to produce in the real experiment. We also began to investigate the effect of temperature on the rate and the result of the product (hydrogen). It also served to discover any errors in the procedure which could affect the final result and prevent us getting accurate results, thus allowing us to eliminate these errors in the real experiment. Diagram: Method: We attached a gas syringe via a plastic tube to a test tube and used a clamp and stand to hold the gas syringe in place. Having poured 25cm of hydrochloric acid (of strength 1M) into the test tube, we placed a strip of magnesium ribbon (which length varied each time we repeated the procedure) ...read more.

Middle

Amount of hydrogen gas produced (cm ) 2 39 3 44 3.5 45 4 56 4.5 63 Here are two tables showing the rate of the reaction between 25cm of hydrochloric acid and a 4.5cm strip of magnesium ribbon when the hydrochloric acid is heated to 40�C and 70�C respectively: Hydrochloric acid heated to 40�C Time (seconds) Volume of gas (cm ) 15 24 30 40 45 45 60 50 75 54 90 60 105 62 120 64 Hydrochloric acid heated to 70�C Time (seconds) Volume of gas (cm ) 15 25 30 39 45 50 60 58 75 62 90 64 105 64 120 64 Conclusion: In the first part of the pilot experiment, we discovered that the correct length of magnesium ribbon to produce approximately 60cm of hydrogen gas when allowed to react with 25cm of hydrochloric acid is 4.5cm. We also became aware of the products of the reaction, magnesium chloride and hydrogen gas. ...read more.

Conclusion

This is because the amount of hydrochloric acid and magnesium does not change, therefore the amount of magnesium chloride and hydrogen will not change, but because the temperature of the hydrochloric acid is higher, the atoms in the hydrochloric acid will be moving faster, and therefore will collide and bond (ionically) with the magnesium atoms quicker. We also discovered several points to remember in the second procedure to ensure accurate, reliable results. The hydrochloric acid was heated in a small beaker and this became very hot, so we had to use tongs to pour it into the test tube. As the reaction begins to happen even more quickly when the hydrochloric acid is heated, we had to ensure also that we were ready to immediately seal the test tube after pouring in the heated hydrochloric acid and placing the magnesium in immediately to avoid the hydrochloric acid cooling. ...read more.

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