User:EagleFalconn/ThermoSandbox
Appearance
What do you think Peter?My comments are below.
Compound | Equilibrium | pKa | ΔH |
TΔS |
---|---|---|---|---|
HA = Acetic acid | HA ⇌ H+ + A- | 4.756 | -0.41 | 26.73 |
H2A+ = GlycineH+ | H2A+ ⇌ HA + H+ | 2.351 | 4.00 | 17.41 |
HA ⇌ H+ + A- | 9.78 | 44.20 | 100 | |
H2A = Maleic acid | H2A ⇌ HA- + H+ | 1.92 | 1.10 | 12.1 |
HA- ⇌ H+ + A2- | 6.27 | -3.60 | 32.2 | |
H3A = Citric acid | H3A ⇌ H2A- + H+ | 3.128 | 4.07 | 21.92 |
H2A- ⇌ HA2- + H+ | 4.76 | 2.23 | 29.4 | |
HA2- ⇌ A3- + H+ | 6.40 | -3.38 | 33.1 | |
HA = Boric acid | HA ⇌ H+ + A- | 9.237 | 13.80 | 66.51 |
H3A = Phosphoric acid | H3A ⇌ H2A- + H+ | 2.148 | -8.00 | 4.26 |
H2A- ⇌ HA2- + H+ | 7.20 | 3.60 | 44.67 | |
HA2- ⇌ A3- + H+ | 12.35 | 16.00 | 86.47 | |
HA- = Hydrogen sulphate | HA- ⇌ A2- + H+ | 1.99 | -22.40 | -11.1 |
H2A = Oxalic acid | H2A ⇌ HA- + H+ | 1.27 | -3.90 | 3.35 |
HA- ⇌ A2- + H+ | 4.266 | 7.00 | 17.34 |
Compound | Equilibrium | pKa | ΔH |
TΔS |
---|---|---|---|---|
B = Ammonia | HB+ ⇌ B + H+ | 9.245 | 51.95 | 104.7 |
B = Methylamine | HB+ ⇌ B + H+ | 10.645 | 44.13 | 104.9 |
B= Triethylamine | HB+ ⇌ B + H+ | 10.72 | 43.13 | 104.3 |
pKa table
[edit]Chemical Name | Equilibrium | pKa |
---|---|---|
Acetic acid [1] | HA ⇌ H+ + A- | 4.756 |
Adenine[1] | HA ⇌ H+ + A- | 4.17 |
Aniline [2] | HA ⇌ H+ + A- | 27 |
Arsenic acid [2] | H3A ⇌ H2A- + H+ | 2.22 |
H2A- ⇌ HA2- + H+ | 6.98 | |
HA2- ⇌ A3- + H+ | 11.53 | |
Benzoic acid[1] | HA ⇌ H+ + A- | 4.204 |
Boric acid [2] | HA ⇌ H+ + A- | 9.21 |
Butanoic acid [2] | HA ⇌ H+ + A- | 4.82 |
Chromic acid [2] | H2A ⇌ HA- + H+ | 0.98 |
HA- ⇌ A2- + H+ | 6.5 | |
Codeine [2] | HA ⇌ H+ + A- | 8.17 |
Cresol [2] | HA ⇌ H+ + A- | 10.29 |
Diethylene glycol [2] | HA ⇌ H+ + A- | 14.18 |
Formic acid[1] | HA ⇌ H+ + A- | 3.751 |
Glycerol [2] | HA ⇌ H+ + A- | 13.99 |
Hydrofluoric acid [2] | HA ⇌ H+ + A- | 3.17 |
Hydrocyanic acid [2] | HA ⇌ H+ + A- | 9.21 |
Hydrogen selenide [2] | HA ⇌ H+ + A- | 3.89 |
Hydrogen peroxide (90%) [2] | HA ⇌ H+ + A- | 11.7 |
Lactic acid [2] | HA ⇌ H+ + A- | 3.86 |
Maleic acid [2] | H2A ⇌ HA- + H+ | 1.92 |
HA- ⇌ A2- + H+ | 6.23 | |
Propanoic acid [2] | HA ⇌ H+ + A- | 4.87 |
Phenol[1] | HA ⇌ H+ + A- | 9.99 |
Phosphoric acid[3] | H3A ⇌ H2A- + H+ | 2.12 |
H2A- ⇌ HA2- + H+ | 7.21 | |
HA2- ⇌ A3- + H+ | 12.38 | |
L-(+)-Ascorbic Acid[1] | H2A ⇌ HA- + H+ | 4.17 |
HA- ⇌ A2- + H+ | 11.57 |
Comments
[edit]The IUPAC recommendation for a table of numbers is for each quantity heading to be "quantity/dimension"
T Delta S in the last column.
When quoting equilibrium constants the IUPAC recommendation in the Compendium of Analytical Nomenclature is to specify the equilibrium, as was done in the goldmine, Table 8. This eliminates any possible ambiguity. I hesitated to do that because I thought it would look messy, but it may be better after all. Here is my suggestion, in part:
Compound | Equilibrium | pKa | ΔH |
TΔS |
---|---|---|---|---|
AH3=Citric acid | AH3 AH2 - + H+ | 3.128 | 4.07 | 21.92 |
AH2- AH 2- + H+ | 4.76 | 2.23 | 29.4 | |
AH- A 3- + H+ | 6.40 | -3.38 | 33.1 | |
B =ammonia | BH+ B + H+ | 9.245 | 51.95 | 104.7 |
The same treatment should be accorded to the table of pK values. Petergans (talk) 08:25, 2 August 2008 (UTC)
- ^ a b c d e f Speight, James G. Lange's Handbook of Chemistry (16th Edition). McGraw-Hill.
- ^ a b c d e f g h i j k l m n o p Knovel Critical Tables (2nd Edition). (2003). Knovel.
- ^ Brown, T.E. (2006). Chemistry The Central Science (10th ed.). Pearson Publications. pp. A27. ISBN 0131096869.
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