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Investigate the effects of HCL on magnesium strips.

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Introduction

TO investigate the effects of HCL on magnesium strips (rate of Reaction) Mg(s) + 2HCl(ag) --> MgCl2(ag) + H2(g) Mg = Magnesium HCl = Hydrochloric acid (s) = Solid (g) = Gas (ag) = Mixed with water What I will be seeing in the beaker as Magnesium and Hydrochloric acid react is the solution fizzing and making bubbles and will see slowly or fast depending on how much concentration there is, Magnesium breaking away and eventually dissolving. The different things I could measure in this reaction to work out the speed of the reaction are: * precipitation * change in mass * the volume of gas given off * high and low concentration Precipitation is when the product is a precipitate, which clouds the solution. To measure the speed of how long it takes for it to disappear is to observe a marker through the solution. Change in mass is usually the gas given off and if put on the mass balance you would see the mass disappearing as the gas is given off. The volume of gas given off is to use a gas syringe, which collects the gas and is then measured of the volume of gas given off. Add more or less concentration is to make the solution more acidic or less and see how long it takes the magnesium to disappear. The particles of acid and magnesium during the reaction. ...read more.

Middle

I will measure this reaction by timing how long it takes for the ribbon to dissolve completely in the acid with high to low concentration. Preliminary work Things we have done in class before we had started the experiment have helped me understand the whole idea of rates. We had been given a worksheet to do called 'How Fast, How Slow?' In this it had questions asking us to put some reactions they have named that take place at home and place them in order of the fastest one first, e.g. Cooking gas burning, Food digesting in the stomach, Gloss paint drying, Flesh decomposing, etc. I knew that 20cm� and 2cm ribbon were the right amounts of acid and magnesium to use in my coursework. I found this out by trying various amounts and realised that this amount was just right as it lasted the right amount of time for me to finish the practical in the short time I have. Prediction I think that in my experiment when I change the acid by 2cm� the time will double every time. This is my prediction because I know that magnesium reacts with acid so if the concentration is less then it will take more time for the magnesium to dissolve. Therefore, I predict that it will probably take double the time for every time the concentration is changed. Apparatus list 30cm Ruler- to measure 2cm of the magnesium Scissors- to cut the magnesium Stopclock- measure the rate of each reaction Beaker- for ...read more.

Conclusion

I think that maybe it hadn't doubled every time I changed the concentration because of human error with measuring or timing. The results were really telling me that this is evidence that it has proven the theory made to be correct! Chemical reactions occur when particles of the reactants collide. Evaluation My method had worked to follow my plan and had gone all to plan. One time my plan had gone wrong because I had measured the wrong amount of acid to go in the beaker. I had started the stop-clock, the magnesium dissolved quite quickly, and then I realised that I predicted it was not meant to be quicker then the one I did before. So I had poured the whole solution back into the sink and done another one this time with the right amount. The results I have are quite reliable because I had been making accurate measurements the whole time and had repeated it as well. To make my results more reliable I could have repeated it more times, but then that would need more time and I only had a certain amount of time to finish it in. In addition, I could have collected class results from other groups who did the exact same experiment as me. There was one anomalous result when there was 0.6m acid and the time it took had risen more than double than the time it took for 0.4m acid. I think this had maybe happened because I had measured the timing wrong. And thanks to WWW.COURSEWORK.INFO.COM Deepak Tailor 11GS Beal High School ...read more.

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