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Does concentration effect the heat of neutralisation between sodium hydroxide and hydrochloric acid?

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Introduction

Does concentration effect the heat of neutralisation between sodium hydroxide and hydrochloric acid? Plan I will try to investigate accurately whether concentration affects the heat of neutralisation between Sodium Hydroxide and Hydrochloric acid. To do this I will need to consider the safety precautions and how I will make sure that this is an accurate and fair test. I also will also look at the equipment that I will use during the experiment. Safety To make sure this experiment is as safe as possible I will make sure that I wear safety goggles whilst doing the experiment and while I am handling the chemicals. This is so that if the acid splashes or if any explosions occur I will not damage my eyes. Accuracy I will try to keep the starting temperature the same every time. I will try and achieve this by taking the first starting temperature and writing it in my results table. ...read more.

Middle

I would prefer to use the measurements I have chosen because I feel that I would be safer and get better results. I will measure out 5cm of 0.2m Sodium Hydroxide and pour it into a test tube. I will then take the temperature of this and write it in my results table. Then, I will measure out 5cm of the Hydrochloric acid, in a clean measuring cylinder that I will have cleaned and dried as possible. I will then pour it into the Sodium Hydroxide and read the thermometer and note down the highest temperature that it reaches. Repeating this procedure for all the Moles until I have collected enough data for my results table. I am going to make the prediction that the stronger the acid the more heat the neutralisation will produce. For example the 0.4M acid will produce more heat than the 0.2M acid. The reason for this is because there are more acid particles in the 0.4M Hydrochloric acid than in the 0.2M hydrochloric acid. ...read more.

Conclusion

The test tubes with the higher starting temperature could have produced slightly higher temperature rises because the particles had more energy than the cooler ones, making the collisions between the particles more frequent, making the temperature raise more. If I was to do the experiment again I would prefer to do it with stronger Chemicals as I believe I will get better results. After my main experiment I conducted another little experiment to see what would happen if I mixed 1M Sodium Hydroxide acid with 2M Hydrochloric acid. I would have expected the rise in temperature to be no more than the 1m Hydrochloric acid because there is only the same amount of Sodium Hydroxide particles for the Hydrochloric acid particles to react with. The noticeable rise is because there was more Hydrochloric acid particles in the solution, there was always more chance of the Sodium Hydroxide particles colliding with a Hydrochloric article. So there are more particles colliding at any one time, I believe that it is for this that the rise is more than expected. ?? ?? ?? ?? ...read more.

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