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Thermodynamics and Triprotic Acid

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1. Citric acid is a triprotic acid (represented by H3Cit). A student mixes together the following solutions in a styrofoam coffee cup:
- 5.00 mL of 0.64 M citric acid
- 45.00 mL of 0.77 M NaOH

The two solutions start at a temperature of 26.0°C, and reach a final temperature of 27.9°C. The final, combined mixture has a mass of 51.6 grams and a specific heat of 4.0 J/g°C. Assume that no heat is transferred to the cup or surroundings.

Calculate the enthalpy of reaction (delta H) for this reaction in kJ/mol. Is the reaction exothermic or endothermic?

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Solution Summary

This solution details step-by-step calculations to determine the enthalpy of the reaction and if it is endothermic or exothermic.

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No. of mole = Molarity(mol/l) x Vol.(l)
No. of mole Citric acid = 0.64mol/l x (5/1000)l
= 0.0032 mole
No. of mole NaOH = 0.77mol/l ...

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