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The remit of my investigation is to investigate whether the reaction between sodium Thiosulphate (Na2 S2 03) and Hydro-Chloric Acid (Hc1) can be changed.

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Introduction

Chemistry Coursework- Mr Ashworth The remit of my investigation is to investigate whether the reaction between sodium Thiosulphate (Na2 S2 03) and Hydro-Chloric Acid (Hc1) can be changed. The balanced equation for this reaction is: - 2Hel (aq)+Na2 s2 o3 (aq) Na Cl (aq)+sd2 (g)S(s)+H20 (l) (Sodium Chloride +Sulphur +Water) To do the Experiment we had to use the following equipment and solutions, -0.4 Mol dm -3 Sodium Thiosulphate -Na2 S203 -2.0 Mol dm -3 Hydro-Chloric Acid (Hcl) -3 Beakers (250cm3) -One beaker (100cm3) -Burette -Conical Flasks (250cm3) -Timer -Water I had to make sure that the experiment was entirely fair, otherwise my results would have been inaccurate. I was using different variables. Sodium Thiosulphate was my variable, and I had to use the same amount of this with the correct amount of water each time. Each time I did my experiment the concentration of my solution changed (there were different amounts of substances). The only substance not to change its measurements was the Hydro-Chloric Acid which was 5cm3. ...read more.

Middle

o Record times in a table of results. My Prediction I predict that as the temperature is increased the rate of reaction will increase. I also predict that as the concentration of the sodium Thiosulphate increases the rate of reaction will increase. This means that both graphs drawn up in my analysis will have positive correlation, and will probably be curved as the increase in rate of reaction will not be exactly the same as the concentration\temperature is increased. This can be justified by relating to the collision theory. When the temperature is increased the particles will have more energy and thus move faster. Therefore they will collide more often and with more energy. Particles with more energy are more likely to overcome the activation energy barrier to reaction and thus react successfully. If solutions of reacting particles are made more concentrated there are more particles per unit volume. Collisions between reacting particles are therefore more likely to occur. However, not all collisions bring about a reaction. ...read more.

Conclusion

All particles are made up of particles, and the particle I was using in the experiment was molecules, which are a group of 2 are more atoms bonded together. To get a chemical reaction, as mine did the particles, must collide together (crash). As you increase the concentration of the acid(Thiosulphate) there are more acid particles in the same volume. Therefore there is a greater chance of it colliding, and reacting with particles. You are increasing the rate of reaction. The reason for the water changing to be cloudy is that we get a Precipitate of Sulphur (Thiosulphate) as the solutions react. Time taken for cross to disappear (S) Volume of Thiosulphate (cm3) Volume of Hydrochloric Acid (cm3) Volume of water (cm3) 1 2 3 Average 50 5 0 28 28 27 26 40 5 10 32 35 33 33 30 5 20 44 47 48 46 20 5 30 62 62 65 66 10 5 40 181 192 185 191 Gcse Chemistry: Rate of Reaction. Written by Georgia Colderwood 11jsL/ 2/5 ...read more.

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