experimental investigation of the Hess s Law of constant heat summation
Title: An experimental investigation of the Hessˇ¦s Law of constant heat summation Objective: Find out the standard enthalpy change of neturalization of hydrochloric acid and ethanoic acid. Principle: The reaction between solid sodium hydroxide and dilute hydrochloric acid NaOH(s) + HCl(aq) „ł NaCl(aq) + H2O(l) ŁGH1 could be carried out in the following two steps : NaOH(aq) + aq „ł NaOH(aq) ŁGH1 and NaOH(aq) + HCl(aq) „ł NaCl(aq) + H2O(l) ŁGH3 According to Hessˇ¦s Law of Constant Heat Summation, ŁGH1 = ŁGH2 + ŁGH3 Procedures: A. Measurement of ŁGH2, the heat of solution of NaOH(s) 1. ... Measurement of ŁGH3, the heat of neutralization 1.