lab3 - NAME and ID Number: Quiz Section: LAB PARTNER:...

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NAME and ID Number: LAB PARTNER: Quiz Section: Total Points = 60 pts Notebook: No points are specifically assigned to your notebook for this lab, however, your TA may deduct up to 5 points for notebook pages that are disorganized, difficult to read, or do not contain complete data and observations. PURPOSE AND METHOD DATA AND CALCULATIONS A: HEAT CAPACITY OF THE CALORIMETER Run 1 Run 2 Run 3 Voltage, V (J/C) 2.1 2.1 2.1 Current, A (C/s) 2.2 2.19 2.19 Time (s) 240.15 242.08 241.96 23.5 24.3 25 27.5 28.3 29.4 *Eletrical power input into calorimeter (q), J 1109.49 1113.33 1112.77 277.37 278.33 252.9 5 pts 269.53 Standard Dev 14.41 Help In Excel type "=average(range of values)" Instead of entering a range, just click at one end of the values and drag mouse to the other end For standard deviation, in Excel type "=stdev(range of values)". Initial temperature, o C Final temperature, o C *Calorimeter Constant, C cal, J/ o C Average, C cal Our goals are to: i) Determine the heat capacity of the calorimeter ii) Measure the heat of fusion of ice iii) Measure the heat of neautralization iv) Determine the enthalpy of hydration magnesium sulfate. Explain how each of these is accomplished in this experiment . (2 pts each = 8 pts): i) Prepare 60.00g of DI water and place it into a calorimeter. Record max voltage and current from leads. Record intial water temperature. Place on stir plate and record amount of time calorimeter takes to heat up 4-5 degrees C. Use Voltage, current and time to calculate Heat capacity of calorimeter with the following equation. Ccal= (voltage * current * time) / (Tfinal - Tinitial). ii) Prepare 60.00g of DI water and record initial temperature. Drop ice into calorimeter and record max stable temperature change. Measure mass of ice cube. Use known heat capacity of calorimeter to determine heat lost by calorimeter. Use information to solve for heat of fusion of ice. iii) Prepare 30ml of HCl and NaOH and record initial temperature. Mix the two in a calorimeter and record max stable temperature change.
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This note was uploaded on 07/08/2008 for the course CHEM 162 taught by Professor N. during the Spring '08 term at University of Washington.

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lab3 - NAME and ID Number: Quiz Section: LAB PARTNER:...

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