Hess Law Hess Law:Work to be done:Find enthalpy change by measuring temperature change of a reaction. Chemicals and apparatus: Thermometer Scale Isolator NaOH, solid NaOH, 0.50M solution Acetic acid, 0.50M and 0.25M Lab: Reaction 1) The temperature of 200ml water that I poured into the isolator was 23.0C. To that I added 1.97g solid NaOH and let the reaction take place. After a while I measured the temperature to 24.9C rT = 1.9C. The number of mole NaOH is 1.97 / 40 = 0.049 mol.

Reaction 2) In this experiment I used 100ml 0.50M acetic acid, and to that I added 100ml 0.50M liquid NaOH. The temperature of the acetic acid was 23C and the temperature of the NaOH was 22C. So the average, and the number I use will be 22.5C. After the reaction the temperature of the solution was 25C, so rT = 2.5C. The number of mole NaOH is 0.50 * .100 = 0.050 mol. Reaction 3) In the third reaction I used 200ml 0.25M acetic acid with a temperature of 22.5C, that I added to 2.00g NaOH.

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