EXPERIMENT 11: PRE-LABORATORY Heat of Acid-Base Neutralization Pre-Laboratory Re

Question

EXPERIMENT 11: PRE-LABORATORY Heat of Acid-Base Neutralization Pre-Laboratory Review Questions and Exercises DUE BEFORE LAB BEGINS. ANSWER ON SEPARATE sHEET oF PAPER. l. In a coffee cup calorimeter, 50.0 ml of 1.00 M NaoH and 500 ml of 1.00 M HCI are mixed. Both solutions were originally at 24.6 "C. After the reaction, the final temperature is 31.3 C. Given that the density of Naci solution is 1.038 g/mL and the specific heat of NaCI solution is 3.87 calculate the AH /mole for the reaction of HCl with NaoH. Assume that no heat is lost to the surroundings. What is the molar heat capacity (c of silver? 3. A 0.0100 mole sample of butane was burned in a bomb calorimeter. The heat from the reaction raised the temperature of 1.00 kg of water by 6.90 C. How much heat was released in this reaction per mole of butane combusted? The specific heat of water is (4.184 l-g C 4. The combustion of 0.1584 grams of benzoic acid increases the temperature of a calorimeter by 2.54 C the heat capacity of this calorimeter. The energy released by the combustion of benzoic acid is 26.42 kl/gram. 5. Define the following terms; a) exothermic reaction b) endothermic reaction CHEM 1411 Experiment 11 I Heat of Acid-Base Neutralization L

Explanation / Answer

q = m x C x DT

q = m x C x (Tf - Ti)

q = amount of heat energy gained or lost by substance

m = mass of sample = 100 x 1.038 = 103.8 gm

C = heat capacity (J oC-1 g-1 or J K-1 g-1) = 3.87 J / g  oC
Tf = final temperature = 31.3  oC
Ti = initial temperature = 24.6  oC

FInd q from the above equation

Q = 103.8 x 3.87 x (31.3 - 24.6)

Q = 2691.43 Joules

Delta H of the reaction = 2691.43 x 1000 / 50 = 53828 joules or 53.828 Killo Joules

Question 2

Molar specific heat is in units of J/K/mol , and is the amount of heat needed (in Joules) to raise the temperature of 1 mole of something, by 1 Kelvin

Molar heat capacity = 108 x 0.28 = 30.24 J/Kmol

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