THERO346: Enthalpy of Neutralization 185 Section Post-Laboratory Questions (use
ID: 1043368 • Letter: T
Question
THERO346: Enthalpy of Neutralization 185 Section Post-Laboratory Questions (use the spaces provided for the answers and additional paper if necessary.) 1. Obtain from your classmates or from your laboratory instructor, the molar enthalpies of of hydrochloric acid, sulfuric acid, and phosphoric acid when each re ur laboratory instructor, the molar enthalpies of neutralization (1) Write a chemical equation for each of these neutralization reactions. (2) Compare the molar enthalpies of neutralization of hydrochloric acid, sulfuric acid, and phosphoric acid. Discuss the similarities and differences of these data.Explanation / Answer
1.
(1) HCl + NaOH --------> NaCl + H2O
H2SO4 + 2NaOH --------> Na2SO4 + 2H2O
H3PO4 + 3NaOH ---------> Na3PO4 + 3H2O
(2) The enthalpy of neutralisation is measured as per the number of moles of water formed. When one mole of water is formed the enthalpy of neutralisation is - 57.7KJ. In case of HCl, H2SO4 and H3PO4 one two and three moles of water are formed respectivelly. Hence enthalpy of neutralisation will be -57.7KJ, 2 X -57.7KJ and 3 X -57.7KJ repectivelly.
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