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     EduGorilla 
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    Directions: The following paragraph describes theory, experiments, data, etc. Read the paragraph and answer the given 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 increase of 5.7oC was measured for the beaker and its contents (Experiment 1). Because the enthalpy of neutralisation of a strong acid with a strong base is a constant (-57.0 kJ mol-1), this experiment could be used to measure the calorimeter constant. In a second experiment (Experiment 2), 100 mL of 2.0 M acetic acid (Ka = 2.0 x 10-5) was mixed with 100 mL of 1.0 M NaOH (under identical conditions to Experiment 1), where a temperature rise of 5.6oC was measured.
    (Consider heat capacity of all solutions as 4.2 J g-1 K-1 and density of all solutions as 1.0 g mL-1.)

    The pH of the solution after Experiment 2 is

    Options :-

    1. 2.8
    2. 4.7
    3. 5.0
    4. 7.0
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