Calorimeter questions

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Soonwoo Chung 1D
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Joined: Wed Sep 21, 2016 2:57 pm

Calorimeter questions

Postby Soonwoo Chung 1D » Wed Jan 18, 2017 7:43 pm

Question from the course reader (pg. 20):
In a constant p calorimeter at 25 degrees Celsius, mix 50.0ml each of 1.0 M HCL and 1.0 M NaOH. After mixing, T=31.9 degrees Celsius. How much heat released?

Why is the problem solved using density and specific heat capacity of just water? I don't understand why the HCL and the NaOH are not involved in solving the problem.

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Re: Calorimeter questions

Postby Chem_Mod » Wed Jan 18, 2017 8:50 pm

Hey Soonwoo! We make an assumption that we can just use water because the amounts of HCl and NaOH are insignificant in the problem

Mikaela Gareeb 3G
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Joined: Wed Sep 21, 2016 3:00 pm

Re: Calorimeter questions

Postby Mikaela Gareeb 3G » Wed Jan 18, 2017 8:57 pm

When HCl and NaOH react with each other, H2O and NaCl form, but because NaCl is a salt, it doesn't react with anything. Whenever you are using density, you should also use specific heat capacity because density times volume equals mass which can be multiplied by specific heat capacity and temperature to get the amount of heat released (in kJ).

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