Heat of Neutralization by Calorimetry

Heat of Neutralization by Calorimetry - Heat of...

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Unformatted text preview: Heat of Neutralization by Calorimetry Name: Mengran Xu ID #: 20347410 Date: December 02, 2009 Partner: Tharshana Sritharan Section # 006 T.A: Moe Ahmed Introduction: In this experiment, the heat of reaction between several different acids and bases were measured a calorimeter. The calorimeter is an assembly which allows no heat to escape. Therefore the system is isolated. A Styrofoam cup and lid was used as the calorimeter, so the system in this experiment was not completely isolated. Since the Styrofoam cup was not completely sealed, the pressure inside the system equals the atmospheric pressure. This means that the initial pressure and the final pressure are equal and thus q, the heat of reaction equals to the enthalpy change, H. Strong acids or bases completely dissociates into ions in diluted solutions. So in a neutralization reaction the net ionic equation is the formation of water from hydrogen and hydroxide ion. Therefore the heat of reaction in neutralization between a strong acid and a strong base is from the formation of water only. For all neutralization involving strong acids and bases, the amount of heat produced will be the same; q=-55.90kJ. Weak acids and bases only partially dissociates into ions. Therefore the heat of reaction from the neutralization of a weak electrolyte will occur in two steps. One step will be the same as those of st rong elect rolytes; formation of water from hydrogen and hydroxide ions. The second part of the heat of reaction occurs from the formation of conjugate base and hydrogen ions from the weak acid or the conjugate acid and hydrogen ions from the weak base. In this experiment the weak acid phenol was used which has an enthalpy change of 25.3k J/mol. The purpose of this experiment was to calculate the molar enthalpy formed from the neutralizat ion between st rong bases and st rong or weak acids from calorimetry. The unknown solut ion #3 of HCl will also be determ ined by calorimet ry. This lab will prove that the calorimeter is an relat ively isolated system which can be used to calculate the molar...
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Heat of Neutralization by Calorimetry - Heat of...

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