Question
When 100 mL of 1.0 M HCl was mixed with 100 mL of 1.0 M NaOH in an insulated beaker at constant pressure, a temperature
When 100 mL of 1.0 M HCl was mixed with 100 mL of 1.0 M NaOH in an insulated beaker at constant pressure, a temperature increase of 0.7oC was measured for the beaker and its contents (Expt. 1). Because the enthalpy of neutralization of a strong acid with a strong base is a constant (-57.0 kJ mol-1), the experiment could be used to measure the calorimeter constant. In a second experiment (Expt. 2), 100 mL of 2.0 M acetic acid (Ka = 2.0 × 10-5) was mixed with 100 mL of 1.0 M NaOH. (under identical conditions of Expt.1) where the temperature rise of 5.6oC was measured.
(Consider heat capacity of all solutions as 4.2Jg-1 K-1 and density of all solutions as 1.0 m mL-1)
Enthalpy of dissociation (in kJ mol-1) of acetic acid obtained from Expt. 2 is.
(A) 1.0
(B) 10.0
(C) 24.5
(D) 51.4
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Quantitative Chemical Analysis
Authors: Daniel C. Harris
9th Edition
146413538X, 978-1464135385
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