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Download e-book for iPad: An Annual publication of satisfactory methods for the by Organic Syntheses

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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.

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An Annual publication of satisfactory methods for the preparation of organic chemicals by Organic Syntheses


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