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Finally, we will make sure that the same person judges when the cross is no longer visible or the reaction times result could not be accurate, as 2 people could have different eyesight and therefore different opinions on when the x has disappeared.
· Surface area raises the amount of collisions because if you split a reactant up into smaller pieces then you will be expanding its surface area.
This means that the particles which are around the reactant will have more surface area to work on, and this means that there will be greater amount of successful collisions per second.
Disappearing X Experiment Introduction I am going to investigate the rate of reaction between sodium thiosulphate (thio) and hydrochloric acid.
Hydrochloric Acid Sodium Thiosulphate "" sodium chloride water sulphur The reactants are both colourless, but one of the products, sulphur, is yellow, so we can use this fact to follow the rates of reaction.
We timed how long it took for the solution to turn cloudy so that the cross could no longer be seen.
We then decided to change the experiment to see if the concentration of the acid affected the rate of reaction.We then added the contents of the cylinder to the conical flask along with the 25cm3 sodium thiosulphate.Variables I changed the concentration of the hydrochloric acid by adding water to it.25 Acid / 0 Water / 25 thio20 Acid / 5 Water / 25 thio15 Acid / 10 Water / 25 thio10 Acid / 15 Water / 25 thio5 Acid / 20 Water / 25 thio Instead of changing the concentration of the acid, we could have added water to the thio, like this:25 Acid / 25 thio / 0 Water25 Acid / 20 thio / 5 Water25 Acid / 15 thio / 10 Water25 Acid / 10 thio / 15 Water25 Acid / 5 thio / 20 Water We could also have changed the temperature of the thio before mixing it with the hydrochloric acid, or the temperature of the hydrochloric acid before mixing it with the thio.I am going to investigate how the concentration of the acid effects the speed of the reaction.Apparatus1 small measuring cylinder1 large measuring cylinder1 small beaker1 large beaker Hydrochloric Acid Sodium Thiosulphate Cross drawn on paper Conical flask Water Stopclock Method First of all we measured out 25cm3 acid and 25cm3 sodium thiosulphate. I will measure the rate of reaction by mixing the different quantities of Sodium thiosulphate (50 - 10cm³) with a fixed quantity (5cm³) of hydrochloric acid in a Conical flask and placing the flask on top of a white sheet of paper with a cross clearly marked on it. In this piece of science coursework I will be experimenting how the rate of reaction between Sodium thiosulphate and hydrochloric acid is affected by the concentration of Sodium thiosulphate.Disappearing Cross Investigation Aim: To see how long it takes for sodium Thiosulphate and hydrochloric acid to react at different concentrations.My Hypothesis: Using the idea of the particle theory, the more dilute a solution is, the more time it will take for the particles to react.I will then measure how long it takes for a chemical reaction to take place.The time might vary depending on the concentration of Sodium thiosulphate.