From Wikipedia, the free encyclopedia
Jump to: navigation, search
en This user is a native speaker of English.
it-3 Questo utente può contribuire con un livello avanzato di italiano.
de-1 Dieser Benutzer hat grundlegende Deutschkenntnisse.
fr-1 Cet utilisateur peut contribuer avec un niveau élémentaire de français.
es-0 Este usuario no entiende español (o lo entiende con mucha dificultad).
This user cannot speak or contribute in Spanish.
Search user languages

Lecturer etc. in inorganic chemistry Leeds University 1964-2003

Strong interest in the application of numerical methods to experimental data (e.g. Numerical smoothing and differentiation, Molecular vibration)

Since 1972, together with Italian colleagues developed general purpose computer programs to obtain stability constants from experimental data - ongoing project. Major contributor to articles relating to equilibria in solution, including, chemical equilibrium, equilibrium constant, determination of equilibrium constants, acid dissociation constant and stability constants of complexes: personal web-site.

Latest publication "HypCal, a general-purpose computer program for the determination of standard reaction enthalpy and binding constant values by means of calorimetry”, Analytical and Bioanalytical Chemistry, 2016, 408 (23), 6413–6422.

Articles shown on "Did You Know?"[edit]

Binding selectivity, Bromley equation, Conductivity (electrolytic), Equilibrium chemistry, Fourier transform infrared spectroscopy, Hydroxide, Ion-association, Jones reductor, Magnetochemistry, Metalloprotein, Oxohalide, Pitzer equations, Polyamino carboxylic acid, plutonyl ion and complexes, Predominance diagram, Selection rule, Specific ion Interaction Theory, Stability constants of complexes, Uranate

Wiki Howlers[edit]

Star howlers[edit]

  • Solubility equilibrium (version 3 July 2010) many solids will become more soluble with increasing temperature, regardless of Le Chatelier's Principle
  • pH (as of 26 May 2012) the units of pH are log(L/mol), although this is seldom indicated explicitly

A general issue with acidity constants[edit]

Many info boxes show acid dissociation constant values without specifying conditions. For example for oxalic acid " Acidity (pKa) | 1.25, 4.14". This is unsatisfactory as the values quoted must refer to a specific ionic strength and a specific temperature, See Equilibrium constant for an example of variation of pK with ionic strength and Temperature dependence for the theory behind temperature dependence.

Howlers corrected[edit]

  1. nickel hydroxide In the chembox(solubility) it is given as "soluble in dilute acid". Nickel hydroxide reacts with acid to produce a solution containing Ni2+ ions, not the hydroxide in solution.
  2. magnesium hydroxide Synthetic magnesium hydrides is often known as milk of magnesia a brilliant typo.
  3. Ionization energy Successive molar ionization energies in kJ/mol (96.485 kJ/mol = 1 eV/particle)
  4. Sodium orthovanadate is the inorganic compound with the formula Na3VO4(H2O)2. It is one of several vanadium(V) oxides !
  5. Elemental magnesium ... unlike the other alkali metals Unbelievable!
  6. Osmosis The osmotic pressure is defined to be the minimum pressure required to maintain an equilibrium minimum!
  7. 18-Crown-6 ... wraps around metal cations, providing an octahedral cavity. It is 6-coordinate, not octahedral.
  8. Niacin pka=4.85. This pK refers to the protonation of the N atom. The carboylic acid part of the molecule has a pKa of ca. 2. This is a howler because only a single value was cited.
  9. Helium exists only as a gas except in extremely cold conditions. Meaningless! Phrase removed.
  10. saponification part III Saponification The alkoxide is more basic than the conjugate base of the carboxylic acid, and hence proton transfer is rapid. :An example of confusion between an equilibrium property, basicity, and a kinetic property, reaction rate.
  11. Chlorite dismutase ..the two substrates of this enzyme are chloride ion and oxygen, whereas its product is chlorite. It's the other way round - oxygen is a product. This error is present in the enzyme catalogue (EC, from which, presumably, it was copied.
  12. Nitrogenase Dinitrogen is quite inert because of the strength of its N≡N triple bond. What is astonishing about this error is that it is followed by a correct statement relating inertness to high activation energy.
  13. Glucose Like all hexoses, glucose has the molecular formula C6H12O6. It has fifteen stereoisomers. Glucose has 15 isomers? What nonsense!
  14. Sulfur trioxide#Structure and bonding (Version 14 Aug. 2014) As sulfur trioxide is centrosymmetric , it has no electrical dipole.The molecule cannot have a centre of symmetry, as it has 3-fold symmetry
  15. Metal ions in aqueous solution version 24 Sept.2013. Raman spectroscopy is particularly useful because the excitation wavelength for the Raman spectra could be choosen in the region of water's transparancy. Nonsense! It's nothing to do with excitation wavenength. Reverted
  16. Savitzky-Golay smoothing filter, version 09:57, 30 May 2013. Omitted value of the data interval in the expressions for derivatives.
  17. Radioactive tracer Phosphorus-32 is frequently used to label amino acids. Revised
  18. Radioactive tracer Tritium and carbon-14-labeled water and glucose are commonly used.. Revised
  19. Fractional crystallization (chemistry) [In] fractional crystallization [of] two or more substances they will crystallize out of solution (precipitate) at different rates. It is not a matter of rates, but of different solubility products which determine the equilubrium state.
  20. polyphosphate: .. are anionic phosphate polymers linked between hydroxyl groups and hydrogen atoms. Article extensively revised
  21. EDTA is an amino acid. Replaced by polyamino carboxylate.
  22. Lutetium is a d-block element In transition metal, version 2 Aug 2009
  23. Caption to image "basic zinc acetate.png" labelled zinc acetate. Featured article zinc!!!
  24. Niobium is in many ways similar to its predecessors in group 4. Featured article niobium!!! Changed to group 5.
  25. metaphosphate A metaphosphate is a salt or an ester of metaphosphoric acid, HPO3
  26. reduction potential The half cell standard potential is given by where Δ G is the Gibbs free energy change. Changed to standard free energy change.
  27. Crystal field excitation dd-transitions on a copper atom that is surrounded by a hexagon of oxygen atoms. Changed in Revision as of 19:38, 17 May 2010 to an octahedra. Finally changed to an octahedron.
  28. Recrystallization (chemistry) Since "Compound A" is in excess this will usually result in these crystals forming first see fractional crystallization, above
  29. Molecular vibration (version 19 December 2010) The three atomic molecule have three modes of vibration irrespective of whether these are linear or nonlinear. Confuses normal modes of vibration with vibration frequencies.
  30. Hydroxide (version 5 December 2010) When hydroxide ion is mixed with hydrogen gas, water forms. Article re-written.
  31. Zwitterion (Version 27 Dec. 2010) Most amino acids at physiological pH are zwitterionic. Confusion between biological pH and isoelectric point.
  32. uranyl: (Version 23 Jan 2011) Examples of uranyl compounds include uranium trioxide Whole article revised.
  33. Technetium-99m(Earlier version):The molybdenum-99 is in the form of sodium molybdate in ion resins. When the Mo-99 decays to Tc-99m this does not form a similar compound Corrected by another editor.
  34. Borate the fictitious ions [ .. H2BO
    , HBO2−
    and BO3−
    are easier to use for pKa values and other calculations. Article revised.
  35. Uranate Uranate is the chemical term for oxide anions of the element uranium. Examples of uranates include UO22-, UO32−, and UO42− Article re-written.
  36. pH "The meaning of the "p" in "pH" is unknown". No it isn't. It means decimal cologarithm
  37. pH "where aH+ is the activity of hydrogen ions in units of mol/L (molar concentration)" Logarithms can only be taken of numbers, so the idea of taking a logaritm of a concentration is nonsense. In fact activity is dimensionless.
  38. Electromagnetic absorption by water Rotational transitions don't affect significantly the absorption spectrum of water. Complete omission of vibration-rotation effects. Article re-wrtten
  39. Buffer solution (Revision as of 08:43, 6 May 2013) most of the added hydroxide ion is consumed in the reaction OH- + HA → H2O + A- ... which results in a decrease in pH. Corrected by user:Edgar181
  40. Borax (as of 1 Oct 2013)... is a salt of boric acid. changed to with an empirical formula Na2B4O7nH2O
  41. Sodium hydroxide (As of 1 Oct 2013) Sodium hydroxide slowly reacts with glass to form sodium silicate. Glass dissolves, forming soluble silicates.
  42. Ascorbic acid (As of 1 Oct 2013) [..] behaves as a vinylogous carboxylic acid. Re-written in terms of electron delocalization stabilizing the ascorbate anion.
  43. Fluorinated ethylene propylene ... initiated with persulfate, which homolyzes to generate sulfate radials. A brilliant typo!
  44. Denticity: EDTA is a unique ligand which forms a chelate by binding to a central metal at six different points. Removed by another editor.

Needing attention[edit]

  1. Iron(III) phosphate Iron(III) phosphate is one of the few molluscicides approved for use in the practice of organic farming, but unlabeled addition of EDTA contradicts such labeling.Insert non-formatted text here What does this mean?
  2. Uranium in the environment#health effects Tiron is a catechol derivative; it is not "phenolic". It is a disodium salt of the disulfonate. The "disulfonic acid", as originally shown, does not exist.
  3. acetylacetone : In the gas phase K is 11.7. The equilibrium constant tends to be high in nonpolar solvents: cyclohexane is 42, toluene is 10, THF 7.2, dimethyl sulfoxide (K=2), and water (K=0.23) Surely values are log K? I don't have a source to check them.
  4. Bond dissociation energy There seem to be conflicting definitions. One at zero Kelvin, which presumably is derived from quantum chemical calculations, and the other obtained from experimental data. The experimental one depends on the conditions used for the measurements.

Failed initiatives[edit]

This list highlights articles which could not be improved due to intransigence of other editors.

  • Convolution The definition of discrete convolution is flawed, as discussed on the talk page.
  • Chemical equilibrium Other editors insist on the primacy of the kinetic criterion over the thermodynamic criterion. The thermodynamic approach is used in Equilibrium chemistry.


Original Barnstar.png The Original Barnstar
Thank you for your extensive contribution to Wikipedia articles on chemistry. Stan J. Klimas (talk) 14:46, 7 December 2008 (UTC)
Chemistrystar.png The Chemistry Star
It is good to have you around! Qualitity articles pave your way. Stone (talk) 23:11, 11 March 2009 (UTC)
Resilient Barnstar.png The Resilient Barnstar
Hi Petergans! I'm glad you learnt to add the references. Unfortunately, it lacks third-party sources. Otherwise, its notability will be challenged. Thanks for your attention. All the best, Kayau (Talk to me! See what I've done! Sign my guestbook!) 05:04, 4 July 2009 (UTC)
Original Barnstar Hires.png The Original Barnstar
For your work on expanding and clarifying the Radioactive tracer article. Thank you! Dac04 (talk) 15:49, 17 May 2012 (UTC)
Editors Barnstar Hires.png The Editor's Barnstar
Just saw your oxyhalide page. Great stuff. Kudos. TCO (talk) 17:28, 14 July 2012 (UTC)

Useful links[edit]

c:Category:Ionic structures construction kit