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CHEMISTRY LAB REPORT Name: Saurabh Lakshman Grade 11 (IB) 17/02/2006 An experiment to determine the enthalpy changes using Hess's law Background Information The main idea behind this experiment is to find out the temperature difference between the room temperature and the final temperature. Sodium carbonate, sodium hydrogencarbonate and hydrochloric acid were used in this experiment. Sodium carbonate, also known as soda ash is got from the reaction of carbonic acid and sodium hydroxide while sodium hydrogencarbonate (baking soda) is a salt formed by the partial replacement of hydrogen by sodium. Data Collection 1) Temperature change by using 3.3g of sodium hydrogencarbonate Mass of the container on which the sample was weighed = 11.48g Mass of the container and the crystals = 14.98g Mass of the container after the crystals were added = 11.70g Mass of the crystals that did not react = 00.20g Mass of the crystals that reacted = 03.30g Time (s) Temperature ( ° C) 0 23.0 30 23.0 60 23.0 90 18.0 120 15.0 150 15.0 180 15.0 210 15.0 240 15.5 270 16.0 300 16.0 2) Temperature change by using 1.88g of sodium...

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