Measurement of Enthalpy example problem in course reader

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juliana alden 2D
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Joined: Fri Sep 25, 2015 3:00 am

Measurement of Enthalpy example problem in course reader

Postby juliana alden 2D » Mon Jan 11, 2016 10:57 pm

In the course reader, the example given reads "In a constant P calorimeter at 25ºC mix 50.0ml each of 1.0M HCl and 1.0 NaOH Afte Mixing T=39ºC
How much heat is released-Assume density of Soln is 1.0 g/ml (PURE WATER) and use specific heat capacity of water, 4.18 J/(ºC*g)"

What if the Molarity of the reactants HCl and NaOH weren't 1.0M? Is it still possible to solve the problem with the given information and, if so, how? Thanks!

Kanwaldeep Rai 2H
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Re: Measurement of Enthalpy example problem in course reader

Postby Kanwaldeep Rai 2H » Mon Jan 11, 2016 11:20 pm

I believe you can still do the problem but you would have to account for the fact that the concentration of one reactant is more than another and thus only a certain amount of H2O can be produced. I think this would become a limiting reactant problem because the mole ratio of reactant to product is one. H+ + OH- -> H2O. So if there was 1 mol of HCl and 2 moles of NaOH, you could still only produce 1 mol of H2O.


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