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An experiment, to investigate the reaction times of different amounts of magnesium (Mg) and hydrochloric acid (HCl).

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Introduction

An experiment, to investigate the reaction times of different amounts of magnesium (Mg) and hydrochloric acid (HCl). Aim To get magnesium and hydrochloric acid to react in 60 seconds Factors * Concentration of acid. * Length of magnesium wire. * Purity of magnesium. * Temperature of room. * Stirring the mixture during experiment. We are going to change the concentration of hydrochloric acid. Prediction Our chosen factor is to change the concentration of hydrochloric acid. We predict that as the concentration of acid decreases, the time of reaction will increase, I think this will happen because as there are less acid particles, the magnesium won't have as many to bump into so the reaction won't be as quick. Apparatus * 100ml beaker * 1 cm magnesium pieces * Pipette * Measuring cylinder * Stop clock * Hydrochloric acid * Water * Goggles * Paper clip Method * Cut the magnesium to pieces of 1cm. ...read more.

Middle

Results Range 10ml acid: 0ml water- 1ml acid: 9ml water Interval 10:0, 9:1, 8:2, 7:3, 6:4, 5:5, 4:6, 3:7, 2:8, 1:9 Precision We will measure all our results to the nearest 10th of a ml. Reliable We will repeat each experiment twice and then find the average. Accurate It will be accurate if they are similar results and if the averages go down as the concentration of acid to water decreases. Independent variable Dependent variable (s) Dependent variable (s) Average (s) Acid: water First time Second time 1:9 600+ 600+ 600 2:8 3:7 180.0 146.3 163.2 4:6 68.0 143.0 105.5 5:5 30.9 49.0 39.5 5.3: 4.7 59.9 58.9 59.4 5.5: 4.5 57.0 60.4 58.7 5.7: 4.3 77.0 73.0 75.0 6:4 42.2 53.9 48.1 7:3 19.8 27.0 23.4 8:2 9:1 10:1 10.5 11.3 10.9 Analysis My line of best fit is a curve, and it shows a ...read more.

Conclusion

I think that they are slightly off because when we were doing the experiment we did those values the next lesson, so we may have used different beakers and different batches of magnesium and hydrochloric acid. I did each experiment twice and then found the averages, most of my results were quite similar except for, when we did 4 acid: 6 water, the first value was 68 seconds and the second was 143 seconds. To make the experiment better, we could have used a burette to get more accurate measurements of water and acid, we could also have used a balance to weigh the mixture until it loses all the magnesium. We carried out a preliminary experiment and our findings in that were quite similar to the results in our actual exam, seeing as the sizes of magnesium wire varied in each experiment. ...read more.

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