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Does the concentration of acid affect the rate of reaction?

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Does the concentration of acid affect the rate of reaction? Chemical reactions can take place at different speeds. A reaction, which is over in a fraction of a second, is a very fast reaction. (It has a high rate of reaction.) As the time taken for the reaction to be completed increases, the rate of reaction decreases, and as the speed for the reaction to be completed decreases the rate of reaction increases. Rate of reaction = 1/time The effect of increasing concentration on the rate of reaction is easy to predict qualitatively from the experiment between magnesium ribbon and hydrochloric acid. In the diagram below it can be seen that increasing the concentration of acid from one mole per dm3 to two moles per dm3, while keeping all the other variables the same causes more bubbles of hydrogen to be formed. I.E increases the rate of reaction. To find out all of this information I have referred to, GCSE science class book by David Baylis, Graham Booth and Bob Mcduell. It is not possible to be sure of a quantitative relationship without carrying out experimental studies. ...read more.


In my experiment I will use the following equipment. Gas syringe, Measuring cylinder, Conical flask, Stop clock, Marble chips (calcium carbonate), Acid, Water, Goggles Clamp and stand. I will make it a fair test by making sure I weigh out as accurately as possible and by using the same equipment such as the same gas syringe. I will make the experiment safe by wearing goggles and making sure I follow the rules of safety. Method I collected the equipment in the list above and set up the clamp and stand holding the gas syringe just above the conical flask so the bung would fit in and the tube from the gas syringe to the conical flask was horizontal. I then weighed out 3 marble chips with the combined weight of 2.1grams. I then measured out the right amount of acid and water mix shown in the table on page 2. I put the acid and water into the conical flask and then put the marble chips in. As soon as the marble chips were in I put the bung firmly in the conical flask and started the stop clock. ...read more.


Other experiments I have done previously testing the rate of reaction are the temperature or the acid and the size of the marble chips, these experiments are shown below. Does the size of the marble chip effect the rate of reaction? Time Large chips Small chips 15 4 14 30 9 30 45 16 44 60 22 54 75 29 64 90 35 79 105 40 84 120 47 98 135 55 off scale 150 56 off scale 165 56 off scale 180 63 off scale Conclusion The smaller the chips the faster the rate of reaction, this is because there is more surface area on the chips therefore they can react faster. Does the temperature of the acid effect the rate of reaction? Time 20degrees 84degrees 15 9 34 30 16 54 45 25 70 60 33 87 75 40 off scale 90 47 off scale 105 54 off scale 120 61 off scale 135 67 off scale 150 73 off scale 165 79 off scale 180 85 off scale Conclusion We have found out that the temperature affects the rate of reaction. This is because in the hydrochloric acid there is water and hydrogen when heated up the hydrogen gains energy making the hydrogen collide with the marble chips more therefore reacting faster. ...read more.

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