In the manner of or by means of alkalimetry; according to methods of measuring alkalinity.
From 'alkalimetrical' + adverbial '-ly' suffix. This adverb form allowed chemists to describe how procedures were performed using standardized measurement techniques.
When scientists add '-ally' to an adjective, they're describing exactly how something is done—'alkalimetrically' means 'in the measured, precise way that chemists determine alkalinity,' turning abstract concepts into concrete methods.
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