The chemical reaction shown below is carried out in a coffee cup calorimeter. A student mixes 10.0 mL of 0.100 M H2A(aq) and 20 mL of 0.100 M NaOH(aq), both initially at 25 °C. The student records the highest temperature of 40. °C for the reaction. a) What indicates that this is an acid-base reaction? Explain your answer. b) Determine the amount of energy involved in the reaction in the coffee cup calorimeter. The density of the resulting solution is 1.00 g/mL and has the same specific heat capacity as water, 4.2 J/g °C. c) Determine the enthalpy of the reaction, in kJ/mol rxn.