Calorimeter Constant: Hot/Cold Water - Find & Check

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Discussion Overview

The discussion revolves around calculating the calorimeter constant using data from an experiment involving hot and cold water. Participants are exploring the methodology for determining the calorimeter constant based on temperature changes and heat transfer calculations.

Discussion Character

  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant presents initial calculations for the heat changes (delta H) of both hot and cold water but expresses uncertainty about the next steps to find the calorimeter constant.
  • Another participant requests clarification on the calculations and points out that the initial post is incomplete.
  • A participant reiterates the need to determine the calorimeter constant and provides additional temperature data, including initial and final temperatures, to clarify their calculations.
  • Concerns are raised about the interpretation of temperature changes (ΔT) and whether they are calculated as initial minus final temperatures.
  • One participant highlights that the calculations must account for the heating of both the cold water and the calorimeter itself, indicating a potential oversight in the initial approach.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the correct approach to calculating the calorimeter constant, and multiple viewpoints regarding the calculations and methodology remain unresolved.

Contextual Notes

There are uncertainties regarding the definitions of temperature changes and the assumptions made about the system, particularly concerning the heat transfer involving the calorimeter.

imapeiceofwod
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Hot water:
v- 50ml
delta t = -28.5

Cold water
v=50ml
delta t = 24.5

delta H of warmwater is a 50g(4.184)(-28.5) = -5962.6
delta H of cold water = 5125.45

From there i don't know what to do to find the Calorimeter constant any help? Also i did the above calculations correct right?
 
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Please elaborate on what you did on what you are calculating. What you wrote is hopelessly incomplete.
 
imapeiceofwod said:
I have to determine the calorimeter constant give this data. The hot water is measure and poured into the cold water. I found delta H of the warm and cold water from there I am unsure what i got to do to determine the constant...

Hot water:
v- 50ml
delta T = -28.5 degrees celsius

Cold water
v=50ml
delta T = 24.5 ceclius

delta H =mc delta T
delta H of warmwater is a 50g(4.184)(-28.5) = -5962.6 J
delta H of cold water = 5125.45 J

From there i don't know what to do to find the Calorimeter constant any help? Also i did the above calculations correct right?

fixed, hopefully it more understandable
 
Much better, although I am still not sure about ΔT listed - are these initial minus final respectively? Is 24.5 difference between initial temperature of calorimeter plus 50 mL of cold water and final temperature of everything?
 
Borek said:
Much better, although I am still not sure about ΔT listed - are these initial minus final respectively? Is 24.5 difference between initial temperature of calorimeter plus 50 mL of cold water and final temperature of everything?

here are the initial values.
Temp of hot water = 75 degrees C
temp of cold water 22 degrees C
Final temp of mixture 46.5 C

With those values i determined delta T
 
OK, as I expected, you forgot that you are heating not only cold water.
 

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