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What is the effect of the concentration of hydrochloric acid and magnesium ribbon.

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Introduction

Chemistry coursework; what is the effect of the concentration of hydrochloric acid and magnesium ribbon. Task In this investigation, I will be looking into the effect of a certain variable on the rate of reaction between magnesium and hydrochloric acid. There are quite a number of variable that I could choose to vary. Some of these include the concentration of hydrochloric acid, temperature of the experiment (temperature of the hydrochloric acid). I could also vary the surface area of the magnesium or the length or mass of the magnesium strips. The last two variables are too hard to investigate here because there is a limited range of values that I could use. The first two are easier to investigate. I am going to investigate the effect of concentration on the rate of reaction. Background science Mg (s) + 2HCl (aq) --> MgCl2 (aq) + H2 (g) This investigation relies on two important scientific facts in order to function; the reaction between magnesium and hydrochloric acid and concentration raises the rate of reaction. The rate of reaction is changed by a few factors; Concentration, surface area, catalysts, agitation and heat. ...read more.

Middle

The results did seem to fit with my hypothesis but these are not results. Method For this experiment the following pieces of equipment are needed: * 2x 80 ml beakers. * 1x measuring cylinder * 150 ml of 2.0 concentration acid * 150 ml of water * 18 cm of magnesium ribbon Set the apparatus up as follows: Results These are the results that I collected: Acid (cm3) Water (cm3) 1st reading (s) 2nd reading (s) Average concentration 50 0 18 23 41 100 40 10 38 19 57 80 30 20 45 39 84 60 25 25 52 55 107 50 20 30 98 108 206 40 15 35 189 195 384 30 These results as a table are not easy to understand but a graph of these results can be seen on a separate graph. Analysis The graph very definitely shows a trend, and a curve can be drawn that supports a negative correlation, (as X gets bigger, Y gets lower), meaning that as the concentration of HCL increases the time taken for the magnesium to dissolve is decreased (higher rate of reaction). ...read more.

Conclusion

These will not really have any effect on the result readings. The main accuracy problem is that the human eye did all of the judgement on when the experiment had finished. Further Work / Extension To extend my knowledge in this subject, I could do another investigation into the effect of temperature on the rate of reaction. I predict that the temperature of hydrochloric acid is directly proportional to the rate of reaction. I could carry out this experiment by doing different temperatures. Suitability of method This experiment was very suitable for the investigation. It got me all the information that I needed, without any problems, and the information was clear to interoperate and understand. It was an easy experiment to carry out. Improvements I could improvement this experiment by using a different method of measuring the finish time in a different method. I could collect all the hydrogen gas produced in a gas syringe, and when a certain volume of hydrogen is collected, I could stop the clock. I don't have to finish the experiment, by only get to a certain volume of gas collected. This would eliminate the inaccuracy of the eye determining the finish point by a huge amount. This would improve the accuracy of my experiment. ...read more.

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