Using Calorimetry to Determine Specific Heat and Heat of a Solution .docx - Using Calorimetry to Determine Specific Heat and Heat of a Solution

Using Calorimetry to Determine Specific Heat and Heat of a Solution .docx

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Using Calorimetry to Determine Specific Heat and Heat of a Solution Submitted by: Christina McCool Partner: Gianna Mercato Date of Submission: Lab Section: CHE110L-10
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Purpose The purpose of this lab was to develop an understanding of temperature, heat, heat capacity, and specific heat. Calorimetry will be used to determine the specific heat of an unknown metal and to measure the heat of solution of an ammonium salt. Procedure The procedure for this lab can be found on pages 71-79 in “General Chemistry CHE110L Laboratory Manual Fall 2017”. Data Tables Carbon copies of data tables have been attached to the back of this lab report. Calculations Specific Heat of a Metal Unknown #1 1. Change in Temperature Metal = 25.0 ˚C - 98.0 ˚C = -73˚C Water = 25.0 ˚C – 21.3 ˚C = 3.7 ˚C 2. q H 2 O = 918.985 x 4.184 x 3.7 = 293.903 J 3. qMetal - q H 2 O = qMetal = - 293.903 J 4. SH metal 293.903 J ( 10.059 x 73 ) = 0.4 J/g. ˚C Heat of Solution 1. Change in temperature Trial 1 16.2 ˚C – 21.6 ˚C = -5.4 ˚C Trial 2 17.5 ˚C – 21.2 ˚C= -3.7 ˚C 2. qSolution Trial 1 (-4.184)(21.484)(-5.4) = 485.401 J Trial 2 (-4.184)(21.173)(-3.7) = 327.76 J 3.
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