An experiment to determine the enthalpy changes using Hess's law

Authors Avatar

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

2) Temperature change by using 1.88g of sodium carbonate

        Mass of the container on which the sample was weighed = 11.48g

Mass of the container and the crystals                  = 13.48g

Mass of the container after the crystals were added     = 13.60g

Mass of the crystals that did not react                  = 00.12g

Mass of the crystals that reacted                       =  01.88g

        

3) Temperature change by using 5.66g of sodium hydrogencarbonate

        Mass of the container on which the sample was weighed = 11.48g

Mass of the container and the crystals                  = 18.48g

Mass of the container after the crystals were added     = 12.82g

Mass of the crystals that did not react                  = 01.34g

Mass of the crystals that reacted                       =  05.66g

        

        

4) Temperature change by using 3.85g of sodium carbonate

        Mass of the container on which the sample was weighed = 11.48g

Mass of the container and the crystals                  = 15.48g

Join now!

Mass of the container after the crystals were added     = 11.63g

Mass of the crystals that did not react                  = 00.15g

Mass of the crystals that reacted                       =  03.85g

        

UNCERTAINITIES

        +/-  0.01g    :                 Digital weighing scale

        

+/-  0.01s    :                 Stop watch

        

+/-  0.05cm3  :                      Measuring cylinder

+/-  0.05°C   : ...

This is a preview of the whole essay