Rate of Reaction Investigation :: Papers

Rate of Reaction Investigation 2HCL + NA ²S ²O ³ à   + 2NaCL Hydrochloric acid + Sodium thiosulphate à   Sulphur + Sodium chloride + S0 ² + H ²0 + Sulphur dioxide + Water Collision Theory For this experiment we can use the collision theory. Collision theory explains how chemical reactions occur and why rates of reaction differ. When particles collide, they may react. A reaction occurs when particle is facing in the correct direction and the collision has enough energy. If more collisions occur, then the chance of a successful collision is higher. [IMAGE] Aim To investigate the rate of reaction between hydrochloric acid and sodium thiosulphate using variables. Equipment Sodium Thiosulphates Hydrochloric Acid Title marked with a cross - Then we will know when the reaction has taken place. Measuring cylinder - Measure how much of solution you use each time, so it's a fair test. Beaker - Where the reaction will take place Bunsen burner - How the temperature can increase. Tripod - To place the beaker onto. Stopwatch - Measuring how long the reaction takes place. Thermometer - To measure how hot the mixture is. Factors/ Variables Catalyst - A catalyst is a substance which increases the speed of a reaction without being changed or used up in a reaction. The catalysis works by giving the reacting particles something to stick to where they can collide into each other; this increases the number of collisions. Concentration - If the solution is made more concentrated it means there are more particles of reactant between the important particles are more likely. Temperature - When the temperature is increased the particles all move quicker, if they are moving quicker, they are going to have more collisions. We used a thermometer to control this. Particle size/ surface area - As the particle size decreases the surface area increases. The rate of reaction will increase because the acid can attack from different places.