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How Does Changing The Concentration Of Acid Affect The Rate Of Reaction Between Hydrochloric Acid And Marble Chips.

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Introduction

How Does Changing The Concentration Of Acid Affect The Rate Of Reaction Between Hydrochloric Acid And Marble Chips. Aim. To find out and investigate if changing the concentration of hydrochloric acid will increase or decrease the rate of the reaction when marble chips are dissolved in hydrochloric acid. Prediction. A reaction occurs when particles collide. This process is based on the 'collision theory'. So therefore, the more particles you have in a space, the more likely they are to collide. Therefore making the reaction accelerate. This theory can be proved if you compare the rates of reaction with marble in hydrochloric acid. 'If the acid is of a higher concentration, the reaction will be quicker'. Also because the particles will have more energy, they will be travelling faster, making them collide more frequently. Therefore I predict that the higher the concentration the faster the reaction will take place this is because in a higher concentration there will more hydrochloric acid molecules. This means that there will be a higher chance of the molecules in the marble chips colliding with the hydrochloric acid molecules and reacting. This should therefore, increase the rate of reaction. ...read more.

Middle

3. I took readings at the same time intervals throughout the experiment i.e. a reading every thirty seconds in all my experiments-this was also important because if the experiment was left for longer then the reaction would have more time to take place therefore the results obtained would have been anomalous. 4. All the experiments lasted for 180 seconds. Safety. 1. I wore safety goggles throughout the duration of the investigation. 2. Extreme care was taken when handling the acid ensuring that the acid was not spilt. It was also made sure that there was nothing near the experiment that could cause an accident or be damaged if an accident did occur. 3. In this experiment I had to make sure that I was careful with all glassware in case it broke, because if it did I had to be prepared to clean up the spillage immediately. 4. I also had to be careful especially with the stronger concentration of acid because as it was corrosive, and I had to make sure that it did not come in to contact with my skin. 5. Most importantly we have to take general care and active awareness when we were carrying things around. ...read more.

Conclusion

There were a couple of points for the experiment to be improved by, firstly by adding the marble chips and placing the cork on top lost time and some of the immediate reaction was lost. The timing was not very accurate, because some of the experiments were left for longer, this obviously increased the error percentage in the results making the result outcome slightly incorrect. The marble chips were also an inaccuracy because some chips were bigger than some so adding to the inaccuracy of the experiment. If I were to repeat the experiment I would find a more accurate way of timing the experiment and also find another way that would ensure that none of the gas would escape. In addition I would also find a more accurate way to weigh the chips and the volume of the hydrochloric acid because the volume of the acid and weight of the marble chips, were not the same for each experiment. I also would use powdered marble because it would mean that the surface areas would be more or less the same. To extend this experiment I would repeat this experiment and also I would try using another reactant instead of hydrochloric acid I would use for example, sulphuric acid. I could also try using something else instead of the marble chips, which would be interesting. 1 Mohammed Patel 11L. ...read more.

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