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Neutralisation - I am going to see whether changing the concentration of NaOH will affect the heat produced when mixed with HCL.

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Introduction

Neutralisation Aim I am going to see whether changing the concentration of NaOH will affect the heat produced when mixed with HCL. Background knowledge Neutralisation is when an alkali is added to an acid to produce a liquid with the pH7. This is the equation for neutralisation is: Acid + alkali = salt + water Or in terms of ions H+ + OH- = H2O The pH scale is a scale from one to fourteen. Fourteen being a really strong acid, the strongest acid there is, seven being a neutral liquid known as H2O and one being a strong alkali. An exothermic reaction is when something gives out heat when reacting with something else and endothermic is when you have to add heat to make something work. The rate of reaction depends on four things: * Concentration. * Temperature. * Catalyst. * Size of particles. Predictions I think that if I change the concentration of the NaOH, there will be more heat produced when mixed with HCL and water I think that if there are more NaOH particles in mixing with the HCL particles more collisions will happen and more heat will be produce. ...read more.

Middle

Method * Set up the three burettes, one with HCL, one with H2O and the other with NaOH * Collect all three needed volumes of the three solutions in three different burettes. * Measure initial temperature of the solutions and record it. * Add all three solutions together and stir * Carefully watch the thermometer and record the peak temperature of the reaction. * Repeat the same experiment twice for added accuracy each time cleaning out the conical flasks. * You should have to do ten experiments in all. Safety * I was very careful doing these experiments not to drop or spill any of the solutions. * I took extra care when handling expensive apparatus like the burettes and the thermometer * All desks were cleared and stools and bags were placed under the benches. * I took of my blazer and tucked in my tie so that it would not dangle in my way when I was doing the experiments. Results Here is a copy of my blank results table: Vol. ...read more.

Conclusion

5.5 15ml 10ml 25ml 0.03 1.2 18 24 6 18 24 6 6 10ml 15ml 25ml 0.02 0.8 19 23 4 19 23 4 4 5ml 20ml 25ml 0.01 0.4 19 21 2 19 21 2 2 Conclusion From the evidence (results in my table) I can conclude that the higher the concentration of HCL the more heat is produced when mixed with NaOH. For example when the concentration of 25 mls of HCL was 2 moles/litre and this was mixed with 2 moles/litre of NaOH the average temperature rise was 6 degrees Celsius compare to when the concentration was the same for NaOH as it was and it was mixed with a weaker solution of HCL of only 0.4moles/litre the average temperature rise was only 2 degrees Celsius. I can also conclude that my prediction was right. I can say that prediction was accurate because of the follow reason. The more particles in the HCL, the faster the reaction would be because there are more particles to hit of each other, then there would be more of a reaction and all these particles would produce more heat when reacting. ...read more.

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