Hess's Law virtual lab.pdf - Virtual Lab Simulation Hess\u2019 Law Procedure was taken from ChemCollective website Link to simulation

Hess's Law virtual lab.pdf - Virtual Lab Simulation...

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Virtual Lab Simulation: Hess’ Law Procedure was taken from ChemCollective website: Link to simulation: (use Chrome or Firefox browser if possible) In this experiment, you will determine and compare the quantity of heat energy released in three exothermic chemical reactions, use the heat released to determine the molar enthalpies of each reaction and explore the concepts stated by Hess’ Law. Reaction 1: Solid sodium hydroxide dissolves in water to form an aqueous solution of ions. NaOH(s) → Na + (aq) + OH - (aq) + Heat (kJ) find Δ H 1 Reaction 2 : Solid sodium hydroxide reacts with an aqueous solution of hydrogen chloride to form water and an aqueous solution of sodium chloride. NaOH(s) + H + (aq) + Cl - (aq) → H 2 O(l) + Na + (aq) + Cl - (aq) + heat (kJ ) find Δ H 2 Reaction 3 : An aqueous solution of sodium hydroxide reacts with an aqueous solution of hydrogen chloride to form water and an aqueous solution of sodium chloride. Na + (aq) + OH - (aq) + H + (aq) + Cl - (aq) → H 2 O(l) + Na + (aq) + Cl - (aq) + Heat (kJ) find Δ H 3 In order to accurately measure the heat released in each reaction, we will be using a calorimeter. (For this experiment a styrofoam cup will act as the calorimeter). The change in temperature that occurs for each reaction will be used to calculate the energy released in kilojoules per mole of sodium hydroxide used. We can assume for our calculations that any heat transferred to the styrofoam and surrounding air will be negligible. We can also assume that the specific heat of water is 4.184 J/g°C. PROCEDURE
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  • Fall '15
  • Enthalpy, Chemical reaction, Sodium hydroxide

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