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Investigation of Energy changes in reaction between NaOH and HCL.

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Introduction

Chemistry Coursework Investigation of Energy changes in reaction between NaOH and HCL. Aim My aim is to find out the heat given out during the neutralisation of HCL and NaOH. HCL will be a constant and NaOH will be varied and mixed with H2O. Background Knowledge Neutralisation is when an acid reacts with an alkali to form a salt and water. Eg. HYDROCHLORIC ACID + SODIUM HYDROXIDE SODIUM CHLORIDE+WATER HCL (aq) + NaOH (aq) NaCl (aq) + H2O (l) ACID + ALKALI SALT + WATER In the above equation the acid HCL is being reacted with the alkali NaOH and a salt NaCl and water is produced. Properties Of Acids & Alkalis Acids Alkalis Acids corrode active metals. Alkalis corrode protein. Acids turn blue litmus into red. Alkalis turn red litmus paper into blue. Acids taste sour. Alkalis taste biter. Acids release a hydrogen ion into aqueous solution. ...read more.

Middle

2) The chemical nature of the acid or alkaline must be kept constant. If the acid is stronger, more heat will be produced, and if the acid is weak, less heat must be produced. Apparatus Beaker Polystyrene cup Cotton wool Thermometer Plastic lid Safety mat Safety goggles Method Acid (HCL)/cm3 Alkaline (NaOH)/cm3 Water / cm3 Total Volume / cm3 25 25 0 50 25 20 5 50 25 15 10 50 25 10 15 50 25 5 20 50 I will have to first measure out the constant which is HCL, then the variable which is NaOH and if any water. When pouring the acid/alkaline/water, I have to make sure that the measuring cylinder is level to my eyes so I don't get more or less solution that I need. I will measure the temperature of both solutions (constant and variable) and take the mean as my starting temperature. ...read more.

Conclusion

(b) I will have to make sure none of the heat is lost to the surroundings, to do this, I will mix the acid, alkali, water in a polystyrene cup, wrapped around in cotton wool and then placed in a beaker, a plastic lid was used to cover the top of the cup and a hole was there for the thermometer to go through. Safety I will have to make sure not to spill any of the acid or alkali anywhere; I will have to wear goggles, as the acid is harmful. Analysis Evaluation My method was fairly good as I noticed hardky any heat had escaped. To improve on more efficiency I could have added cotton wool on the lid as heat rises and this would have stopped it from escaping. Conclusion The graph supports my prediction that the more concentrated the variable, the more heat would be given off and as you can see, that is the same on my result graph. ...read more.

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