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To find if changing the concentration of an acid will increase or decrease the rate of the reaction when marble is dissolved in hydrochloric acid.

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PLANNING Aim To find if changing the concentration of an acid will increase or decrease the rate of the reaction when marble is dissolved in hydrochloric acid. Equipment I will be using the following apparatus, One conical flask to put the marble chips in and also to put the acid in so they react. . A piece of delivery tube, this carries the gas to the measuring cylinder this also has a stopper on the end to go on the top of the conical flask to stop the gas escaping. Two measuring cylinders, one to measure the amount of acid and one for the amount of water to make my acid concentrations, so that I don't make mistakes when measuring just in case I out both liquids in the same test tube and have to much then have to pour away it would not be a fair test One clamp One clamp stand Thermometer 5 sets of 3grams of marble chips 2 Molar Hydrochloric acid Water Gas Syringe Stopwatch Method Since I will be working with strong acid, I will wear safety goggles while conducting the experiment. ...read more.


Acid (cm3) 50 0 40 10 30 20 20 30 10 40 Fair Test To be sure I can rely on my results I will repeat he experiment twice or three times if necessary, because there is chance of inaccurate results for many reasons. Keep the out side temp the same by using a thermometer as It is important to keep the starting temperatures constant for all the reactions as this can affect the results by giving the particles more energy (and making it faster). Use the same weight of marble chips so that there is not more marble chips in one of the experiments which will mean there will be more for the acid to reacted with always keep to the same amount of concentration, which is 50cm3 so that each experiment is fair otherwise if one has more solution then they may be more acid which would result in more reactive particles and an unfair test Preliminary Experiment I have carried out a preliminary experiment so that I would have extra information so I would be able to know if my previous plan would succeed in the experiment. ...read more.


I know this, as I will be investigating the effect of concentration on the rate of a reaction. If a solution is made more concentrated, then there are more reactant particles per set volume. This makes collisions between the reactant particles more likely. Therefore there will be more collisions per second and as a consequence, more particles reacting per second. so, the rate of the reaction is increased I predict that the solution with the high concentration of acid will have a much faster rate of reaction than the weaker solution I have predicted this from my scientific knowledge and the knowledge I gathered from my preliminary experiment. I think that this happened because the more acid in the solution the greater the concentration and there will be more particles colliding and more energy and therefore a faster rate of reaction. The reason I think that the rate of reaction will increase is that the experiment is exothermic, this means that it will give itself more energy and therefore more collisions and faster collisions. Therefore I predict that the rate of reaction will increase with the concentration of the acid solutions ...read more.

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