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Investigate the effect of concentration in the rate of a reaction.

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Introduction

BY DARREN HALIL 10 MAL Preliminary Work. Aim- Our aim is to investigate the effect of concentration in the rate of a reaction. Method- Below is a step-by-step guide to exactly what we did to do the experiment. The first thing we did or we do in any experiment involving acid is put on safety goggles so we do not ruin our eyes. > We then went and gathered up the equipment to complete the experiment. The list is below: > A Balance (scales) > A gas syringe (100 cm cubed) > 3m Hydrochloric acid > A conical flask. > A clamp stand > A Beaker > A Measuring cylinder > Three grams worth of marble chips > Stopwatch * We measured twenty millilitres of Hydrochloric acid in the measuring cylinder we then poured the Hydrochloric acid into the conical flask. * We then got a square piece of paper and then placed it on the balance. We pressed the button with the T symbol on it; this then turned the units to zero grams. * We then got the tub of marble chips and measured out three grams of marble chips. * We then put the marble chips into the hydrochloric acid that we poured into the conical flask, and then we quickly put the cork ,that was on the end of the gas syringe, into the top of the conical flask. ...read more.

Middle

This reaction is reacting slowly. The catalyst is then added, this makes the reaction increase in speed; however, the catalyst is not physically or chemically changed. Method > The first thing we do in any experiment involving acid is to put on a pair of safety goggles. > We then went and collected the equipment from the equipment trolley. The equipment is listed below...... > Clampstand > Measuring Cylinder (100 ml) > Gas Syringe (100cm cubed) > Hydrochloric acid (three molar) (20 ml) > A balance (scales) > Conical flask > Beaker > Stopwatch > Two grams of marble chips * We set up the clampstand by standing it up right. We then opened up the arm on the clampstand and placed the gas syringe into the open arm of the clampstand and twisted the key on the side of the clampstand arm to close it. We made sure that the units were visible to us so that we could take the readings during the experiment. * Once the gas syringe was set up , we got the marble chips and went over to the balance. We got a rectangular piece of paper and placed it onto the balance. We then pressed the button with the T sign on it. This then put the units to zero. ...read more.

Conclusion

The results proved that we did each part correctly. The concentrations of the molars we experimented on, we had to make ourselves. To measure the amount of concentrated acid (ml). We knelt down to eye level to measure, because if we stood up and read it , we would be looking at it from a different angle ; therefore, we would have been getting a different reading. The results were abnormal, already said earlier, some of the lower concentrated acids reacted faster. This may have been because of change in room temperature, or most probably the surface area of the marble chips. We could have made two grams of marble chips from a lot of small ones or a couple of big ones. There were a lot of thing we could have done to improve the experiment. For example we could have controlled the room temperature by turning of the heating. We would have would have also restricted the amount of people in the class. The reason would be because it would reduce the overall body temperature. We would also have used a bigger gas syringe. We were only restricted to syringes that could hold one hundred cubic cm's worth of carbon dioxide. We would also have changed the amount of concentrations we did. We would have done a 0.5 molar test aswell. We also would have probably increased the amount of marble chips to three grams. ...read more.

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