The Rate of a Chemical Reaction When Changing the Concentration of Hydrochloric Acid

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The Rate of a Chemical Reaction When Changing the Concentration of Hydrochloric Acid I am going to investigate the effect of the concentration of the acid solution, Hydrochloric acid to see how this changes the rate of reaction. For my experiment I will use sodium thiosulphate as my constant and I will be changing the concentration of hydrochloric acid and water. I predict that as the concentration of hydrochloric acid increases, the rate of reaction also increases. I also think that the time taken for the experiment to finish will decrease as the concentration of the hydrochloric acid will increase. These graphs show my expected results: [IMAGE] In a high concentration, there are more particles of hydrochloric acid in a certain volume, this means there is a higher chance of a collision because there are more acid particles. As there are more collisions, the rate of reaction will increase. The 'Colliosion Theory' supports my prediction as for a chemical reaction to happen, the reacting particles must bang into, or collide, with each other with enough force or energy ( the activation energy) to break bonds. This is collision theory. If the particles do not have have this energy, they will just harmlessly bounce off one another. If two particles meet, they may rebound with no reaction, but if they collide with enough force, a chemical reaction will occur. (The Dorling Kindersley Science Encyclopedia) [IMAGE] In the low concentrated solution, it shows there are less particles of hydrochloric acid to collide with the sodium thiosulphate particles. In the second box, the high concentrated solution there are more particles of hydrochloric acid, so the chance of collision is increased. Method I am aware that there are many safety precautions which I will have to follow: · Immediately wash hands and other parts of skin if incontact with hydrochloric acid as it is an irritant and is harmful to skin and eyes. · Rinse out mixture in flask and leave water running to get rid of the
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