Investigate Temperature Change During a Neutralization Reaction

Topics: Sodium hydroxide, Chemistry, Chlorine Pages: 4 (889 words) Published: January 23, 2013
Investigate temperature change during a neutralization reaction

When an alkali neutralizes an acid, a salt and water are formed. Aqueous hydrogen ions (H+(aq)) from the acid react with the hydroxide ions (OH-(aq)) from the alkali, forming water. For hydrochloric acid and sodium hydroxide:

H+(aq) + Cl-(aq) + Na+(aq) + OH-(aq) Na+(aq) + Cl-(aq) + H2O(l) Hydrochloric acid
Hydrochloric acid

Sodium Chloride
Sodium Chloride
Sodium Hydroxide
Sodium Hydroxide

Neutralization is an exothermic reaction which means it gives out energy to the surroundings in the form of heat. There’s only a chemical reaction occurring between H+ and OH- ions as the Na+ and Cl- ions in the product is uncharged H+(aq) + OH-(aq) → H2O(l)

The combination of H+ and OH- ions in this way releases heat energy. The aim of this experiment is to measure the temperature changes during the reaction between hydrochloric acid and sodium hydroxide solution. Research question:

What happen to the temperature of the solution when using different concentration of acid? Hypothesis:
Since the volume is kept constant and when the concentration of the acid increases, the acid particles also increase. So the concentration will be directly proportional to the temperature change. Because neutralization is an exothermic reaction, during the reaction, the temperature will increase until the point of neutralization (at which point the temperature is at its highest), and after this point, the temperature will start to decrease. My hypothesis is as long as we increase the concentration of acid, the temperature of solution is increased due to more acid particle moving in the solution and cause heat loss.

* Burette 0.5
* Ring stand and ring clamp
* Measuring cylinder 0.5
* Data logger and Temperature sensor
* Beaker 1.0
* Stirring rod
* Safety goggle

* Hydrochloric Acid (HCl) 3M, 2.5M, 2M, 1.5M, 1M
* Sodium...
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