In the following examples comparing acid strength down a group we will interpret the given thermodynamic data for four acids (HF, HCl, HBr, and HI) reacting with water.
1. Lets first explore enthalpy of the reaction.
e. Predict the relative strength of the H-X bond for these four acids. (What is the
trend from weakest to strongest bond?)
f. Compare your answer from Part E to the bond enthalpy data for each substance in
the gas phase shown here. (Do your answers match?) Explain.