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Category > Chemistry Posted 27 Apr 2017 My Price 10.00

Task 2: Investigation of Hess’s Law

Ali 1
Task 2: Investigation of Hess’s Law
Purpose:
The purpose of this experiment is to test the concept of Hess’s Law through the use of
calorimetry by determining the enthalpy of neutralization of sodium hydroxide and hydrochloric
acid.
Materials: Electronic balance Styrofoam cup Water Thermometer Scoopula 100 mL graduated cylinder Solid sodium hydroxide Aqueous sodium hydroxide Aqueous hydrochloric acid
Data Table: Parts 1 & 2 link: https://www.youtube.com/watch?v=8yFjgAtB8yg
Part 3 link: https://www.youtube.com/watch?v=ljenRO_BpN8 Ali 2
Calculations:
1. For part 1, find the ∆H1 of the reaction. Show your work.
NaOH(s) -> NaOH(aq)
2. For part 2, find the ∆H2 of the reaction. Show your work.
HCl(aq) + NaOH(aq) -> NaCl(aq) + H2O(l)
3. For part 3, find the ∆H3 of the overall reaction.
HCl(aq) + NaOH(s) -> NaCl(aq) + H2O(l)
4. Find the ∆H3 of the reaction. Next, compare this to the sum of parts 1 and 2 by using
Hess’s law. Show all your work.
5. Find the percent error of ∆H1 and ∆H2 in comparison to ∆H3.
% error = ( ∆ H 3 )−[ ( ∆ H 1 ) + ( ∆ H 2 ) ]
( ∆ H 3) x 100 Questions:
1. Did you prove or disprove Hess’s law of heat Summation? Explain.
2. How does this experiment illustrate the Law of Conservation of energy?
3. Critique the calorimeter we used. What further improvements might help reduce
your percent error?
4. Conclusion?

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SuperTutor
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Status NEW Posted 27 Apr 2017 02:04 AM My Price 10.00

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