Effect on Enthalpy Changes By Using HNO3 Instead of HCl

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  • #1
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Homework Statement


What effect, if any, would using nitric acid instead of hydrochloric acid in the reaction

NaOH(s) + HCl(aq) --> NaCl(aq) + H2O(l)

have on the enthalpy changes measured in an experiment?


Homework Equations



N/A

The Attempt at a Solution



I have no idea. Some experimental values I found online suggest that using nitric acid would give a lower enthalpy change value? But I wish to know the reasoning behind this.
 

Answers and Replies

  • #2
Ygggdrasil
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Consider the net ionic equation for both reactions.
 
  • #3
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Um after doing that i got the net reaction of
OH-(aq) + H+(aq) --> H2O(l)
for both reactions...so does that mean there is no effect???
 
  • #4
Borek
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does that mean there is no effect???

Yes.

With one important comment. HNO3 is the weakest of the so called strong acids, thus it is not necesarilly 100% dissociated (1% not dissociated in 0.1M solution). Thus enthalpy of the reaction between HNO3 and NaOH has to take HNO3 dissociation into account. No idea how large the difference is and how precise the experiment has to be for the difference to be measurable, but it exists.

But that's close to nitpicking.

--
 

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