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Additional info for An Annual publication of satisfactory methods for the preparation of organic chemicals
A species which donates protons in a reaction (Lowry-Brensted) or accepts electrons (Lewis). Base. A species which accepts protons in a reaction (Lowry-Brensted) or donates electrons (Lewis). Complex. A compound which is formed in a complexation reaction between two or more species which are capable of independent existence. Most complexes of analytical importance involve dative bonds between Lewis bases and metal ions. Ligand. A species with at least one Lewis basic site which can participate in complex formation.
However, such a comparison is not valid because of the different dimensions of the two constants and such stability comparisons can only be made in a loose sort of way. To rationalize the experimental1y observed stability it is necessary to consider the formation reaction in a slightly more detailed way. Stage 1 of this reaction involves the breaking of Ni-H 20 bonds in the [Ni(H 20)6]2+ species and stage 2 the formation of Ni-N bonds. Both stages are similar in chelate and nonchelate systems so it is unlikely that /lll
If the concentrations are expressed in mol dm - 3, Ka and Kb have the same units. 3 lists pKa values for some typical compounds. 15). 18) reflects the not surprising inverse relation between Ka and Kb . It is only when K. and Kb for a compound are of different magnitudes that it may be classified as an acid or base. 2 x 10- 10 mol dm - 3. 3. 3 shows that values of Ka and Kb vary over a wide range and also that there is no clear dividing line between strong acids and weak acids or strong bases and weak bases.
An Annual publication of satisfactory methods for the preparation of organic chemicals by Organic Syntheses