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How The Rate Of Reaction Changes In A Reaction Between Hydrochloric Acid And Sodium Thiosulphate

1118 words - 4 pages

Chemistry coursework:An investigation of the affect of the concentration an of the rate of reaction.Introduction.We are trying to find out the affect of acid concentration on the rate of reaction, we are using 2, 1.5, 1, 0.5, 0.25 Molar acid. In our experiment, we are reacting it with sodium thiosulphate. The collision theory will be involved in this, for instance the more concentrated the acid we use, the faster the reaction will occur and the lower the concentration the slower the reaction will occur, this is because the collision theory says that if something is more concentrated then it will collide more because there will be more of the substance. We could use a catalyst to speed up the reaction, this allows the molecules to move around easier to help them to collide more to speed up the reaction for instance say that people are trying to get over wall it is possible but it will take a slow process and say that we add a catalyst, our catalyst is a ladder this enables the people (molecules) to get over the wall quicker and easier than they normally would. In this experiment we need to control the amount of acid, amount of water, chemicals\water temperature amount of sodium thiosulphate and to all agree when the x is gone on the paper. We need to be safe when doing this by wearing goggles and making sure that we dispose of the end result chemical in a large beaker in the fume cupboard and not down the sink, we also need to make sure we do not lean over the conical flask when we perform the experiment because the chemical fumes are pungent and are not good to breath in.Method.We are going to measure the rate of reaction by how fast or slowly the mix of chemicals and water goes cloudy by placing a piece of paper with a cross on it underneath the conical flask and all agreeing when it has disappeared from sight.In this experiment we will need to use the following:Equipment UseStop clock To time the experimentConical flask To collect all the chemicals together inBurette To measure accurately all the chemical and waterSodium thiosulphate Chemical used in this experimentHydrochloric acid Chemical used in this experiment, we will use 2, 1.5, 1, 0.5 and 0.25 molar strengthsWater Used in this experiment, used in dilutionsPaper Used along with cross of colour to determine when mixture is cloudy enoughBeakers Used to hold the chemicals and waterDilutionsTo obtain the different strengths of hydrochloric acid we will need to dilute 2 molar acids and dilute it with water to reach the appropriate strength these are:(Final measurement =20 ml so we have enough to repeat 4 times if needed)Hydrochloric acid (ml) Water (ml) New strength (molar)20 0 215 5 1.510 10 15 15 0.52.5 17.5 0.25Method-flow diagram of experimentFirst we will get 5ml of hydrochloric acid of the required concentrationThen we will get 10 ml of sodium thiosulphateFollowed by 40ml of water (all of which are kept in separate beakers)We will put a conical flask on a piece of paper with a cross on...

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