Calorimetry question (unaccounted heat loss)

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Discussion Overview

The discussion revolves around the effects of unaccounted heat loss during an acid-base neutralization reaction on the reported value for the enthalpy of neutralization. Participants explore the implications of heat loss in calorimetry, particularly in different types of calorimeters, and the accuracy of temperature measurements.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant notes that heat loss to the calorimeter can affect the reported enthalpy of neutralization, but does not specify how.
  • Another participant questions the implications of rapid heat loss that does not result in observable temperature change, seeking clarity on its effect on enthalpy determination.
  • A different participant challenges the previous responses, indicating a lack of satisfactory explanation regarding the original question.
  • One participant suggests that the thermometer's response time and accuracy could influence the measured temperature change, thus affecting the calculations of heat loss.
  • A participant raises a question about the comparative temperature change in a glass calorimeter versus a styrofoam cup, proposing that better heat conduction in glass may lead to greater heat loss and affect measurements.
  • One participant expresses frustration with the nature of the questions posed, suggesting they are designed to confuse rather than educate.

Areas of Agreement / Disagreement

Participants express differing views on the implications of heat loss and measurement accuracy, indicating that multiple competing perspectives remain without a consensus on the effects of these factors on enthalpy calculations.

Contextual Notes

Participants do not fully resolve the assumptions regarding heat loss, measurement accuracy, and the specific effects of different calorimeter materials on temperature readings.

FLgirl
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1. An acid-base neutralization reaction is exothermic. For the measurement of the enthalpy of neutralization, for the reaction, heat is inevitably lost to the calorimeter (beaker or styrofoam cup). How will this unaccounted for heat loss affect the reported value for the enthalpy of neautralization for the reaction?



2. enthalpy (heat) of neutralization = heat released by neutralization reaction / moles of acid or base that react



3. The Attempt at a Solution ..I'm stumped, I need someone smarter than me to explain this to me.
 
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Imagine the heat is lost so fast you don't observe a temperature change inside the calorimeter. What would be the determined enthalpy of neutralization?
 
Considering you didn't answer my question... how does that explain anything?
 
It does. If you don't see how, please answer and I will try to guide you to the moment when you will understand.
 
Think about your tools... the thermometer itself has to react in order to measure the temperature change. If it's measurement is off (as all measurements are), then how will that affect your analysis of what's happening?

If you've actually lost 10 units, but your measurement is showing that you lost 8 units, how will that affect your calculations?
 
ps.:
1. Will the recorded temperature change for an exothermic reaction performed in a glass calorimeter be greater or less than that in a styrofoam coffee cup calorimeter? Assume glass to be a better conductor of heat than styrofoam.
If glass is a better conductor, then heat will move through it faster, right? If more heat leaves rather than being measured by the thermometer, then... ?

By the way, I hate these questions. They're dumb, because this is stuff that you'll come to realize on your own. This crap is just teachers trying to come up with something to trip up some students to prevent everyone from getting good grades. It's dumb.
 

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