Question

A student determined ΔHneutzn for the reaction of sodium hydroxide and acetic acid, using the procedure described in this module. The student added 100.0 mL of 0.8500 M NaOH to 100.0 mL of 0.8404 M acetic acid. Prior to and following the mixing of the acid and base solutions, the following temperature-time data were collected. Time Temperature, °C Temperature, °C Time Temperature, °C min NaOH HOAc min mixture 1 17.52 6 23.28 0.5 17.73 7 23.03 1.0 17.54 8 23.10 1.5 17.75 9 23.06 2.0 17.55 10 22.99 2.5 17.77 11 22.93 3.0 17.57 12 22.89 3.5 17.78 13 22.85 4.0 17.58 14 22.78 4.5 17.80 15 22.73 5.0 mixing mixing 16 22.70 17 22.64 18 22.59 Plot the temperature-time data and determine the mean temperature of the unmixed reagents (average the two initial temperatures. Spell check Determine ΔT of the reaction mixture from the graph. Spell check Calculate the heat absorbed by the reaction mixture. You may assume the density of the reaction mixture was 1.02 g mL-1 and the specific heat of the reaction mixture was 3.822 J g-1 K-1. Spell check Calculate the amount of heat absorbed by the calorimeter, thermometer, and stirrer, using 34.8 J K-1 as the calorimeter constant. Spell check Calculate the total heat absorbed. Spell check Find the total heat released by the reaction of 100.0 mL of 0.8500M NaOH and 100.0 mL of 0.8404 M acetic acid. Spell check Identify the limiting reagent. Spell check Find ΔHneutzn for the reaction