Sodium Thosulphate
Plan an investigation into the rate of reaction between Sodium thiosulphate and hydrochloric acid.* The equation for the rate of reaction is 1/time.* The rate of reaction measures the speed of reaction. It is a measure of the loss of reactants and gain of products.* The faster a reaction takes place, the shorter the time needed for the reaction to finish.* An example of a slow reaction is rusting* An example of a fast reaction is sodium and water.This predicts what will happen to the speed of a reaction if a variable like surface area, concentration and temperature. This theory says that when particles collide a reaction occurs.* With a greater surface area a solid, particles collide far more frequently and as a result the reaction rate is greater.* If there is a higher concentration the particles are closer and they have a greater chance of colliding. The more collisions, the faster the reaction.* The higher the temperature the faster the particles are going to move. This means that there are many energetic collisions that will speed up the reaction.
In conclusion my results are sufficient enough to prove that the collision theory is correct. This happens because the ions are much closer in concentrated solutions so there is a greater chance of collisions and the more collisions the faster the reaction. I could also have made mistakes when timing the reaction, but this was improved when I repeated each concentration three times. Prediction for graph:For my investigation I will use 1/time for the rate of reaction. The reliability of this investigation is suitable enough to support a firm conclusion that the rate of reaction speeds up if the concentration of a solution is higher. In this experiment the speed of the reaction is proportional to the concentration of the acid. * Place the conical flask onto a tile with a black cross on it. When the volume of water is higher the reaction is slower. * Repeat three times and take an average. and chemical equation, for this reaction, which takes place in a solution: NPlan:The variables you can change in this experiment are:* temperature* concentration of acidThe variables that we will be keeping constant are:* the volume of acidEquipment List:* funnel* conical flask* measuring cylinder * tile with black cross* stopwatch* sodium thiosulphate * hydrochloric acid* waterDiagram:Prediction:I predict that the rate of reaction would get faster, if the volume of sodium thiosulphate was increased. Evaluation:For this investigation we can conclude that a higher concentration results in a faster rate of reaction speed. The results from the investigation all follow a similar pattern and prove that my prediction for this experiment was correct. acid concentration /m average time -min30 0 5 0. This anomalous result was recorded for 20cm3 of Sodium thiosulphate and 10cm3 of water.
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