Experiment: To measure the molar enthalpy change for the dissolution (enthalpy of solution) for various compounds.
Answer Text: Experiment: To measure the molar enthalpy change for the dissolution (enthalpy of solution) for various compounds:(i) Procedure;- A clean 250#cm^3# glass or plastic beaker is wrapped with a newspaper leaf.- About 50#cm^3# of tap water is measured into the beaker and the steady temperature noted.- The beaker is held in a tilted position and 2#cm^3# of and sulphuric acid added into the water.(ii) Apparatus:Caution:- Concentrated sulphuric acid should always be added to water and never vise versa.Reason:- The mixture is then carefully but vigorously stirred using a thermometer and the highest temperature of the solution recorded.The experiment is repeated with other compounds:-Ammonium nitrate solid-Potassium nitrate solid-Sodium hydroxide pellets.-Sodium nitrate solid Results and observations. Calculate the enthalpy change (ΔHsoln) in each experiment done. Additional information;- Density of concentrated Sulphuric acid =1.84g#cm^-3#- Density of water =1g#cm^-3#- No change in volume when any of the solids dissolved in water- The specific heat capacities of the solutions=#4.2kjkg^-1k^-1#
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