CHEM 101DL Lecture Notes - Thermodynamics, Thermochemistry, Sodium Hydroxide
1 Jul 2018
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In question 4 of the first, thermochemistry, homework you determined that the enthalpy of
reaction
!"#$%
&
was
'()*+, -.
/&0
for the following process:
"1234
5,,,,, 6 ,,,,,, 7"1234
8,,,, 9 ,,,,,, ":70;3,
This generalized reaction is applicable to, say the reaction of the strong acid, HCl, with the
strong base, NaOH.
A weak acid, for example acetic acid, which you encountered in lab recently and noticed due to
its vinegar-like odor, would very likely have a less exothermic heat of reaction when
neutralized with hydroxide ion. In fact, the heat of reaction is
'((*< -.
/&0
.
=">=77",,,,, 6,,,,,, 7"1234
8,,,, 9 ,,,,,, =">=77
1
23
4
8,,,,, 6 ,,,,,,":70;3 ,,,,,,,,,,!"#$%
&? '((*<
-.
/&0
Given these two pieces of information, calculate the enthalpy of ionization of acetic acid:
=">=77",,,,, 9 ,,,,,,=">=77
1
23
4
8,,,,, 6 ,,,,,,,,,"1234
5,,,,,,,!"#$%
&?,,,,,@,,
-.
/&0
Given, too, that the enthalpy of neutralization of HCN is
'AA*B -.
/&0
, write out the appropriate
reactions and calculate the enthalpy of ionization of HCN.
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Document Summary
In question 4 of the first, thermochemistry, homework you determined that the enthalpy of was 56. 8. This generalized reaction is applicable to, say the reaction of the strong acid, hcl, with the strong base, naoh. A weak acid, for example acetic acid, which you encountered in lab recently and noticed due to its vinegar-like odor, would very likely have a less exothermic heat of reaction when neutralized with hydroxide ion. In fact, the heat of reaction is 55. 9. Given these two pieces of information, calculate the enthalpy of ionization of acetic acid: Given, too, that the enthalpy of neutralization of hcn is 44. 7 reactions and calculate the enthalpy of ionization of hcn. The heats of combustion of ch4, c3h8 , and c6h14 are -890. 3, -2219. 5, and -4163. 0 respectively. The fuel efficiency can be predicted from the amount of heat evolved for every gram of fuel consumed.
