When a chemical reaction is run in aqueous solution inside a calorimeter, the te

Question

When a chemical reaction is run in aqueous solution inside a calorimeter, the temperature change of the water (and Ccal) can be used to calculate the enthalpy change for the reaction. Here, we will study the reaction of hydrochloric acid with sodium hydroxide in the calorimeter from problem 3. Equal volumes (50.0 mL) of 1.00 M sodium hydroxide and 1.00 M hydrochloric acid are mixed.

HCl+NaOHNaCl+H2O

Calculate the total heat (in Joules) released or absorbed by the reacting molecules. Express heat absorbed as a positive number or heat released as a negative number.

Ccal is 1234.28 j and final temperature is 28.0 °C while initial temperature is 21.2 °C

Explanation / Answer

During the reaction heat transferred = - heat transferred t the calorimeter

Heat transferred to the calorimeter = heat capacity of calorimeter x (final temperature - initial temperature)

= 1234.28J x (28.0-21.2)

= 8393.1 J

As the value is positive heat is absorbed by the calorimeter and

heat is given by the reaction of HCl and NaOH

Ths the total heat released by the reacting molecules = -8393.1J

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