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# To investigate how different concentrations of acid affect the rate of a reaction with Magnesium ribbon and how long it takes for the magnesium to dissolve.

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Introduction

Investigating the rate of reaction of Different concentrations of Hydrochloric acid reacting With Magnesium Aim: To investigate how different concentrations of acid affect the rate of a reaction with Magnesium ribbon and how long it takes for the magnesium to dissolve. Apparatus: Apparatus - Test tubes timer Pipette Hydrochloric acid Test tube rack Measuring cylinder Magnesium ribbon Safety - goggles Lab coat Introduction: The rates of reaction depend upon how often and how hard the reacting particles collide with each other the more collisions the more there is an increase in the rates of reaction. The 4 things that affect the rate of a reaction is the temperature, concentration, surface area and also the catalyst. I think the higher the concentration of the Hydrochloric acid, the more faster the reaction will be with the Magnesium .The reaction will be faster, if the acid is more concentrated. The word equation for this reaction is: Magnesium + Hydrochloric acid Magnesium chloride + Hydrogen gas The symbol equation for this reaction is: Mg(s) ...read more.

Middle

Fair test: To make it a fair test, I will keep the size of the Magnesium ribbon (2cm) the same and keep the Hydrochloric acid volume 10cm. To make it reliable, I will repeat the test 3 times for each concentration and take an average of the time taken for the Magnesium ribbon to dissolve. Results: The results I found from the experiment are as follows: Acid (m) 1st test (secs) 2nd test (secs) 3rd test (secs) Average (secs) 0.5 300.49 360.42 300.43 320.64 1.0 107.48 110.53 107.60 108.57 1.5 39.55 44.55 42.25 42.21 2.0 24.19 25.20 26.82 25.40 I got the average by adding all the time together and dividing it by the number of times we did the experiment (3) Conclusion: My results were fairly accurate. My results are not very accurate. The thing that isn't accurate is the relationship on the results table of the molars and that is on the 0.5 section where it says300.49 for the first test and then 360.42 for the second and then after that it says 300.43 when doing the test it ...read more.

Conclusion

I think I may have got the results wrong because I may have got mixed up with the molars of acid. My prediction was correct. I found that the higher the concentrations of acid the quicker the time it would take for the magnesium to dissolve. The higher the concentration of the Hydrochloric acid, the quicker it will take for the Magnesium ribbon to dissolve. Evaluation: My results were accurate the second time round. I could make the experiment better by doing it again a few more times, so that I could/may get more accurate results. If I did the experiment again could do the experiment 5 times instead of three times like in my results. My method was good and I followed it exactly how I wrote it out and every thing went fine except for the fact that I got mixed up with the result because it was slightly different in the 0.5 molars ?? ?? ?? ?? Aamena Sidat : Science coursework ...read more.

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