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Word choices for Blank 2: Endothermic, Exothermic (choose one) When the phosphoric acid and sodium hydroxide solutions are mixed together, the temperature should A. because the reaction is Question 5 (2 points) Part 1: Why do we have to calculate a calorimeter constant (what does the calorimeter constant account for)? Part 2: Can a calorimeter constant have a negative value? Explain why or why not. Question 6 (2 points) 51.8g of aqueous phosphoric acid is mixed with 51.3g of aqueous sodium hydroxide in a calorimeter. The initial temperature was 20.9 Celsius (C) and the final temperature was 30.2 Celsius (C). The calorimeter constant is 21.72J/C and the heat capacity of the final system is 4.00J/gC. Based on this data (and equations provided in the lab manual), the enthalpy of the reaction (Hrxn) would be calculated as A. kJ (report to 3 sig figs and include appropriate sign)