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To investigate the effect of temperature on the rate of reaction between magnesium (Mg) and 1M hydrochloric acid (Hcl).

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Introduction

Investigation into the effect of temperature on the rate of reaction between Magnesium and 1M Hydrochloric acid AIM To investigate the effect of temperature on the rate of reaction between magnesium (Mg) and 1M hydrochloric acid (Hcl). PLAN How to carry out the experiment: To begin with, put on safety glasses and set up the apparatus ensuring you fill the Burette with water, invert it, place on the retort stand and stand in water. But don't place it over the delivery tube because you should allow the gas enough time to pass up the delivery tube and into the water that the Burette is standing in. Then take some magnesium over to the balance and weigh it to 5.00g. When you have the exact amount, place it into the conical flask. Then measure 20cm3 volume of hydrochloric acid using a measuring cylinder making sure you have the correct temperature of acid. Check this by using a thermometer. To increase the temperature of the acid I hope to use a water bath set to 60oC and allow the acid sufficient time to heat up to the right temperature. ...read more.

Middle

Repeats and Range: For each test the best way to get an accurate reading is to do the experiment at least 3 times (repeats) and then add up the results and divide the total by 3 to get an average reading of gas collected. We can find the gas collected by using the scale on the Burette. A range of 5 temperatures will be used to help draw a conclusion and at the following temperatures (oC): * 4 oC (closest as possible to achieve in the lab instead of 0oC) * 20 oC * 30 oC * 40 oC * 50 oC I will increase the temperature after 20oC by 10 oC each time until 50 oC is reached, since it will allow me to see the increase in rate of reaction and 5 results should be enough to help me identify a conclusion. Safety: There are a number of safety issues that apply to this experiment. One of the most important ones is to wear safety goggles at all times. Make sure you don't boil your acid because it's extremely dangerous and can burn you if spilt (that's why we're using a maximum of 60oC). ...read more.

Conclusion

50oC hydrochloric acid, which was the highest temperature that I used, produced the fasted rate of reaction because more gas had been produced. I repeated all 5 temperatures three times to be sure that they were reliable results and in all cases the higher the temperature, the higher the rate of reaction. I had stated this in my prediction. Evaluating Evidence I believe that the experiment was successful but there were a few problems. Although the initial rate of reaction seemed to fit a pattern there were many errors that could have left me with anomalous results. Firstly, I had realised that gas had escaped through the thistle funnel as soon as the experiment started. Therefore I had to cover the thistle funnel with the palm of my hand. And it took a second or two to start the stopwatch once the experiment had started. I could have been much more accurate by using a gas syringe. To improve the experiment I would put the hydrochloric acid into the conical flask first and then put in the piece of magnesium, which would allow minimal gas to be lost because it saves time from pouring in 20cm3 through the thistle funnel. Info: from science exercise book, science teacher, and science chemistry book. ...read more.

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