Disappearing Cross Experiment

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The purpose of the experiment is to determine whether or not increasing temperature will increase the rate of the reaction. Reaction rate is a way of measuring how fast the reaction takes place. So the higher the reaction rate the faster the reaction takes place and the lower is the reaction time is. Research Question How does reaction rate change with increasing temperature of sodium thiosulphate in a reaction between hydrochloric acid (HCl(l)) and sodium thiosulphate (Na2S2O3(l)) ? Hypothesis With increasing temperature of sodium thiosulphate the reaction rate will increase as well. Justification As the collision theory states for a chemical reaction to occur particles need to collide at a certain speed and angle. Increasing the temperature gives particles more energy, so they move faster. As they move faster more collisions happen, hence more successful collision, which increases the rate of the reaction1. Materials> Hydrochloric acid HCl(l)> Sodium triosulphate Na2S2O3(l)> 250 ml3 beaker> 50 ml3 conical flask> 2 x 25 ml3 measuring cylinder> Thermometer> Stop clock> Tea kettle> Blank card> Pen Variables Reaction time is the dependent variable, as it depends on the temperature of the solution. The temperature of the solution is the independent variable, as it does not depend in anything. This can also be concluded from the fact that it is the temperature that is changed in this experiment. The concentration and the amount of the reactants used are the controlled variables, as they have to stay constant throughout the experiment. Method of data collection It is important to carry out this experiment in a safe way, due to the fact that sodium thiosulphate and hydrochloric acid are being used. These liquids are highly dangerous as they can damage skin and eyes. To carry out the investigation in a safe way goggles and an apron were on all the time. The area where the

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