Question

50.0 mL of 0.100 M KOH, at 20.00^{o} C, is added to
50.00 mL of 0.110 M HCl, at 20.00^{o} C, in a coffee cup
calorimeter. The enthalpy of neutralization is 56.0 kJ/mol. The
specific heat capacity of the total solution is 4.184 Jg^{-1
}^{o}C^{-1}, and the density of the total
solution is 1.00 g/mL, what is T_{f} for the reaction?

Answer #1

Number of moles of KOH

Number of moles of HCl

0.005 moles of KOH will neutralise 0.005 moles of HCl. But 0.0055 moles of HCl are present. Hence, HCl is in excess and KOH is limiting reagent.

The enthalpy of neutralisation is 56.0 kJ/mol.

Heat associated with neutralisation of 0.005 moles of KOH is

Convert the unit from kJ to J

Total volume of solution

The density of solution is 1.00 g/mL.

Mass of solution

The specific heat of solution is 4.184 J/g/oC

Initial temperature is 20.00 deg C.

Note: Since during neutralisation of a base with an acid, heat is released, the final temperature is higher than initial temperature. Hence, to obtain final temperature, the temperature change is added to initial temperature.

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