hus be a pilation of pK values for ionisable Рsubstances. РAlmost all the entries in Chapters 4, 5 and 6 have CAS (Chemical Abstract Service) Registry РNumbers to identify them, and these have been entered for each substance. Unlike chemical Рnames which may have more than one synonymous name, there is only one CAS Registry РNumber for each substance (with only a few exceptions, e.g. where a substance may have Рanother number before purification, or before determination of absolute configuration). To Рsimplify the method for locating the purification of a substance, a CAS Registry Number Index Рwith the respective page numbers has been included after the General Index at the end of the Рbook. This will also provide the reader with a rapid way to see if the purification of a particular Р xi
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