### Understanding Heat of DissolutionWhen a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter.#### Laboratory ExperimentIn this experiment, a general chemistry student observes the dissolution of 0.79 g of KOH(s) in 104.10 g of water. The temperature of the solution increases from 24.69 °C to 26.63 °C.#### Calorimeter DetailsThe heat capacity of the calorimeter, also known as the calorimeter constant, was determined in a separate experiment to be 1.58 J/°C.#### ObjectiveThe goal is to calculate the enthalpy of dissolution of KOH(s) in kJ/mol based on the observations made by the student.Assumption: The specific heat of the solution is assumed to be equal to the specific heat of water.\[ \Delta H_{\text{dissolution}} = \text{________ } \text{kJ/mol} \]#### Diagram ExplanationThe accompanying diagram shows a coffee cup calorimeter setup:- **Thermometer:** Used to measure the temperature change during the reaction.- **Cardboard or Styrofoam Lid:** Acts as insulation to prevent heat loss.- **Nested Styrofoam Cups:** Provide further insulation.- **Reaction Occurs in Solution:** The actual chemical reaction takes place within the water inside the cups.Using this setup, the student can measure temperature changes accurately to determine the heat involved in the dissolution process. This experiment helps in understanding how different substances interact with water in terms of energy transfer.

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When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 0.79 g of KOH(s) are dissolved in 104.10 g of water, the temperature of the solution increases from 24.69 to 26.63 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.58 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of KOH(s) in kJ/mol. Assume the specific heat of the solution is equal to the specific heat of water. AH dissolution= kJ/mol Book Cengage Leaming Thermometer Cardboard or Styrofoam lid Nested Styrofoam cups - Reaction occurs in solution.

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 0.79 g of KOH(s) are dissolved in 104.10 g of water, the temperature of the solution increases from 24.69 to 26.63 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.58 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of KOH(s) in kJ/mol. Assume the specific heat of the solution is equal to the specific heat of water. AH dissolution= kJ/mol Book Cengage Leaming Thermometer Cardboard or Styrofoam lid Nested Styrofoam cups - Reaction occurs in solution.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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