Question

The initial temperature of 100.86 g of 0.1 M HCl solution in a calorimeter was 24.9...

The initial temperature of 100.86 g of 0.1 M HCl solution in a calorimeter was 24.9 °C. After a student added 99.98 g of 0.1 M NaOH to the calorimeter and mixed well, the final temperature was 34.5 °C. How much heat was released by the neutralization reaction? Assume the specific heat of the mixture to be 1 cal/g·°C.

Express your answer in kcal.

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Answer #1

A known volume of HCl solution of exactly known concentration is allowed to react with a strong alkali in dilute solution. The temperature change is then noted. With the known volume of HCl solution, the heat of neutralisation can be calculated. It is the amount of heat evolved when V cm3 of HCl solution of concentration C g/litre equilibrium dcm-1 is neutralised completely.

Thus,

Where,

= The amount of heat gained (cal).

= The volume of acid (cm3).

=The concentration of acid (g/L).

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