Enthalpy (Heat) of Solution for the Dissolution of a Salt Trial 2 Trial 2 Trial
ID: 591563 • Letter: E
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Enthalpy (Heat) of Solution for the Dissolution of a Salt Trial 2 Trial 2 Trial 1 Time Temp Time Temp Time Temp Time Temp Time Temp Tume Laboratory Questions Circle the questions that have been assigned. I. Part A.1. The 200-mm test tube also contained some water (besides the metal) that was subsequently added to the calorimeter (in Part A.4). Considering a higher specific heat for water, will the temperature change in the calorimeter be higher, lower, or unaffected by this technique error? Explain. Part A.5. In measuring the specific heat of a metal, Josh used the highest measured temperature for calculating the metal's specific heat rather then the extrapolated temperature. Will this decision result in a higher or lower specific heat value for the metal? Explain. 3 Part B. The enthalpy of neutralization for all strong acid-strong base reactions should be the same within experimental 4. Part B. Heat is lost to the Styrofoam calorimeter. Assuming a 6.22'C temperature change for the reaction of HCKa) 5. Part B.3. Jacob carelessly added only 400 mL (instead of the recommended 500 mL) of 1.1 M HCI to the 50.0 mL of error. Explain. Will that also be the case for all weak acid-strong base reactions? Explain. with NaOH(ag), calculate the heat loss to the inner 2.35-g Styrofoam cup. The specific heat of Styrofoam is 1.34 J/g."C 1.0 M NaOH. Explain the consequence of the error. 6. Part B.3. The chemist used a thermometer that was miscalibrated by a plus 2'C over the entire thermometer scale. Will this factory error cause the reported energy of neutralization, AH,to be higher, lower, or unaffected? Explain. 7. Part C.3. If some of the salt remains adhered to the weighing paper (and therefore is not transferred to the calorimeter), will the enthalpy of solution for the salt be reported too high or too low? Explain. 8. Part C. The dissolution of ammonium nitrate, NH,NO, in water is an endothermic process. Since the calorimeter is not a perfect insulator, will the enthalpy of solution, Af, for ammonium nitrate be reported as too high or too low it this heat change is ignored? Explain. 04 Calorimetry 176Explanation / Answer
1)
The temperature change will be lower.
Water has higher specific heat. It means that it can absorb higher amounts of heat and rise very little in temperature.Hence, the heat which was initially present is being absorbed by water which doesn't give the required rise in temperature owing to it's higher specific heat.
2)
In measuring the specific heat of a metal, Josh used the highest measured temperature for calculating the metal’s specific heat rather than the extrapolated temperature. This decision result in a lower specific heat value for the metal.
Explanation:
q = m c t
t = t final – t initial
The extrapolated temperature is used to determine the maximum temperature of the mixture rather than the highest recorded temperature in the experiment; his decision will result in a lower specific heat value for the metal, because the temperature change is inversely proportional to Specific heat
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