Neutralisation- Enthalpy Change

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Measurement of Enthalpy change

Of Neutralisation

Calculations:

Formula for calculating enthalpy change is [Q = M x C x change in T]

  • Q is enthalpy change, which is measured in Joules
  • M is the mass of liquid used, which is measured in grams
  • C is the specific heat capacity of the liquid, which is constantly 4.2 J deg¯¹g¯¹
  • Change in T is the temperature change, which is the highest temperature minus the initial temperature

Formula for calculating moles is [N = C x V]

  • N is the number of moles
  • C is the concentration of liquid used, which is measured in moles/dm³
  • V is the volume of liquid used, which is measured in dm³

(d)

Enthalpy change of HCL:

Enthalpy change (Q) of HCL = M x C x change in T

                 = (25 + 21.5) x 4.2 x 6.9

                 = 46.5 x 4.2 x 6.9

                 = 1347.57 J

No of moles = C x V

         = 1 x 25/1000

         = 0.025

1/0.025 = 40

40 x 1347.57 = 53902.8

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53902.8/1000=53.9028

ENTHALPY CHANGE = -53.90 kJ mol¯¹

Enthalpy change of HNO3:

Q = M x C x change in T

        = (25 + 21) x 4.2 x 7.2

        = 46 x 4.2 x 7.2

        = 1391.04 J

No of moles = C x V

         = 1 x 25/1000

         = 0.025

1/0.025 = 40

40 x 1391.04 = 55641.6

55641.6/1000=55.64kJ

ENTHALPY CHANGE = -55.64 kJ mol¯¹

Enthalpy change of H2SO4:

Q = M x C x change in T

        = (25 + 24) x 4.2 x 8.1

        = 49 x 4.2 x 8.1

        = ...

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