Rates of Reaction :: Papers

Rates of Reaction Prediction (Na2 S2 O3 + 2HCL --- 2NaCl + SO2 + S + H2O) This is the equation for Sodium Thiosulphate reacting with 2 Molar of Hydrochloric Acid. There are a number of varyings in the essay which must be controlled in tramp for the examine to be a fair test. These include temperature, which must be kept constant throughout the experiment or the results would not match. The experiment go forth be performed at room temperature (Around 25 degrees). Another variable is volume of Hydrochloric acid, which must be kept the same as well. For this experiment, I will be using 5cm of HCL. If all of these variables are controlled, and whence the experiment will be a fair test. However, there will be a degree of human error because there is no definate drive at which the cross disappears, it relies on human judgement. My prediction is that as the parsimoniousness of Sodium Thiosulphate decreases, the rate of answer will decrease accordin gly and the reaction will take longer to complete. This is the basic principle of the Particle Theory. The tinge theory is that if there are less atoms to collide into apiece other and react, then the reaction will be slower than if there were more atoms to collide. Therefore, if the concentration, so number of atoms if lower, then the bill of collisions between Sodium Thiosulphate and Hydrochloric Acid will be less frequent. Also, when the concentration of Sodium Thiosulphate is higher, the water will prevail cloudy faster due to the fact that there will be less water available to disrupt the reaction. IMAGE As the reaction takes place, the amount of Hydrochloric Acid and Sodium Thiosulphate decreases, which therefore decreases the probability of the two atoms hitting each other, reacting. The reaction will slow down, because if two Thiosulphate atoms or two HCL atoms collide, then nothing will happen. This is the particle theory. Method Equipm ent Beakers Measuring cylinders