Lab 6: Heat of Reaction and Hess’s Law

Purpose: The purpose of this lab is to verify Hesss righteousness of Additivity of Reaction Enthalpies Chemical Reaction/Physical Reaction: 1.) Na(aq) + OH(aq) -> NaOH(s) 2.) NaOH + HC2H3O2(aq) -> H2O(l) + Na(aq) + C2H3O2 3.) Na(aq) + OH(aq) + HC2H3O2(aq) -> H2O(l) + Na(aq) + C2H3O2 detect of Materials:Digital Thermometer, foamed polystyrene cups (3), 250 mL beaker,Weighing boat or sm totally beaker, nonplus cylinders, 100mL(1), 25 mL(2),sodium hydrated oxide pellets, sodium hydroxide 2.0M, Acetic common 1.0M and 2.0M. Safety Considerations: Always have safety goggles contend song your eyes, do non inhale the fumes of chemicals used. Also to not eat or drink chemicals used in this lab. war machine operation:Begin by assembling the calorimeter using styrofoam cups. thrust a hole in the lid. personality the initial temperature of the transparent in the calorimeter. Watch the thermometer until maximum temperature is achieved. Weigh out 2.0g of NaOH pel lets. Record the temperature of the distilled urine in the calorimeter until the temperature is constant then add all of the pellets at once. Gently stir the pellets until the acid is dissolved by shiver the the apparatus. Lift the calorimeter lid and wash out its confine and the thermometer. geminate this experiment using 50.0 mL of 1.0M acetic acid. bear experiment using 25.0 mL of each 2.0M sodium hydroxide and 2.0M acetic acid.

Data Table(s): Reaction equation Mass of loyal NaOH Initial Temp. concluding Temp Delta T NaOH 2.0351 g 23.6 C 31.8 C 8.2 C HC2H3O2 1.9966 24.8 C 41.6 C 16.8 C NaOH + HC2H3O2 25.4 C 32.8 C 7.4 C ! Calculations/Results: 2.0g NaOH/ 40.0g NaOH= .05M NaOH 174.8kj + -351.12kj = -176.32 174.8 + -351.12) - (154.66) / 154.66 = 2.14% Questions/Problems:Pre-Lab 1.) 2Na+(aq) + OH-(aq)+ HC2H3O2(aq) -> H2O(l) + 2NaOH(s)+C2H3O2-(aq) 2.)Na+(aq) + OH-(aq) -> NaOH(s) +NaOH(s) + HC2H3O2(aq) -> H2O(l) + Na+(aq) + C2H3O2-(aq) 2Na+(aq) + OH-(aq)+ HC2H3O2(aq) -> H2O(l) + 2NaOH(s)+C2H3O2-(aq) 3.) The...If you want to get a full essay, recount it on our website: OrderCustomPaper.com

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