enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Acid dissociation constant - Wikipedia

    en.wikipedia.org/wiki/Acid_dissociation_constant

    Because the relationship pK b = pK w − pK a holds only in aqueous solutions (though analogous relationships apply for other amphoteric solvents), subdisciplines of chemistry like organic chemistry that usually deal with nonaqueous solutions generally do not use pK b as a measure of basicity.

  3. Proton affinity - Wikipedia

    en.wikipedia.org/wiki/Proton_affinity

    The higher the proton affinity, the stronger the base and the weaker the conjugate acid in the gas phase.The (reportedly) strongest known base is the ortho-diethynylbenzene dianion (E pa = 1843 kJ/mol), [3] followed by the methanide anion (E pa = 1743 kJ/mol) and the hydride ion (E pa = 1675 kJ/mol), [4] making methane the weakest proton acid [5] in the gas phase, followed by dihydrogen.

  4. Acidity function - Wikipedia

    en.wikipedia.org/wiki/Acidity_function

    The term acidity function is also used for measurements made on basic systems, and the term basicity function is uncommon. Hammett-type acidity functions are defined in terms of a buffered medium containing a weak base B and its conjugate acid BH + :

  5. Acid strength - Wikipedia

    en.wikipedia.org/wiki/Acid_strength

    Its conjugate base is the acetate ion with K b = 10 −14 /K a = 5.7 x 10 −10 (from the relationship K a × K b = 10 −14), which certainly does not correspond to a strong base. The conjugate of a weak acid is often a weak base and vice versa.

  6. Pyrophosphoric acid - Wikipedia

    en.wikipedia.org/wiki/Pyrophosphoric_acid

    For comparison with the pKa's for phosphoric acid are 2.14, 7.20, and 12.37. At physiological pH's, pyrophosphate exists as a mixture of doubly and singly protonated forms. When molten, pyrophosphoric acid rapidly converts to an equilibrium mixture of phosphoric acid, pyrophosphoric acid and polyphosphoric acids.

  7. Field effect (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Field_effect_(chemistry)

    Field effects can therefore tune the acidity or basicity of bonds within their fields by donating or withdrawing charge density. [5] With respect to acidity, a common trend to note is that, inductively, an electron-withdrawing substituent in the vicinity of an acidic proton will lower the pKa (i.e. increase the acidity) and, correspondingly, an ...

  8. Leveling effect - Wikipedia

    en.wikipedia.org/wiki/Leveling_effect

    Acid-base discrimination windows of common solvents [1]. Leveling effect or solvent leveling refers to the effect of solvent on the properties of acids and bases. The strength of a strong acid is limited ("leveled") by the basicity of the solvent.

  9. Edwards equation - Wikipedia

    en.wikipedia.org/wiki/Edwards_equation

    Brønsted and Pederson first discovered the relationship between basicity, with respect to protons, and nucleophilicity in 1924: [3] where ⁡ = + where k b is the rate constant for nitramide decomposition by a base (B) and β N is a parameter of the equation.