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JEE Advanced2015ChemistryIonic EquilibriumActual

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 5.7 o C 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 k J m o l - 1 ) , this experiment could be used to measure the calorimeter constant. In a second experiment (Expt. 2), 100 mL o

Options

  1. A2.8
  2. B4.7
  3. C5.0
  4. D7.0

Correct answer

B. 4.7

Step-by-step solution

Final solution contain 0.1 mole of C H 3 C O O H and C H 3 C O O N a each. Hence it is a buffer solution. p H = p K a + log [ C H 3 C O O - ] [ C H 3 C O O H ] = 5 - l o g 2 + l o g 0.1 0.1 = 4.7

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