Sunday, December 8, 2013

Lab 6: Heat of Reaction and Hess’s Law

Purpose: The purpose of this lab is to verify Hesss fairness 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 localise of Materials:Digital Thermometer, foamed polystyrene cups (3), 250 mL beaker,Weighing boat or sm completely beaker, invite cylinders, 100mL(1), 25 mL(2),sodium hydrated oxide pellets, sodium hydroxide 2.0M, Acetic bumpy 1.0M and 2.0M. Safety Considerations: Always have safety goggles secure song your eyes, do non inhale the fumes of chemicals used. Also to not eat or drink chemicals used in this lab. soldiery operation:Begin by assembling the calorimeter using styrofoam cups. thud a hole in the lid. translate the initial temperature of the runniness in the calorimeter. Watch the thermometer until maximum temperature is achieved. Weigh out 2.0g of NaOH pellets. Record t he 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 circumscribe and the thermometer. geminate this experiment using 50.0 mL of 1.0M acetic acid. excerpt experiment using 25.0 mL of each 2.0M sodium hydroxide and 2.0M acetic acid. is a professional essay writing service at which you can buy essays on any topics and disciplines! All custom essays are written by professional writers!
Data Table(s): Reaction equation Mass of substantiality 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:

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