This provides a second means of predicting the sign of Delta H-d; then, through introduction of the van't Hoff equation, a numerical value for Delta H-d can be calculated. The goal of the inquiry activity is to verify Hess's law using the evaluated experimental values of Delta(r)a, ...
The values of pK1 + pK2 for the dissociation of carbonic acid have been determined in seawater as a function of temperature (0 to 45°C) and salinity (5 to 42). They were determined by the addition of NaHCO3 to seawater stripped of CO2 until the pH0 = 1/2(pK1 + pK2) was ...