Relating to acidimetry or the measurement of acids; determined by or using acidimetric methods.
From 'acidimetry' plus the adjective suffix '-ical' (variant of '-ic'). Both '-ic' and '-ical' forms exist, though '-ic' is more common in modern usage.
The '-ical' suffix often appears in older scientific terminology—'acidimetrical' and 'acidimetric' mean the same thing, but you'll mostly see the shorter '-ic' version in contemporary chemistry textbooks.
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