1. The problem statement, all variables and given/known data What effect, if any, would using nitric acid instead of hydrochloric acid in the reaction NaOH(s) + HCl(aq) --> NaCl(aq) + H2O(l) have on the enthalpy changes measured in an experiment? 2. Relevant equations N/A 3. The attempt at a solution I have no idea. Some experimental values I found online suggest that using nitric acid would give a lower enthalpy change value? But I wish to know the reasoning behind this.