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Wikipedia - مؤشر الأس الهيدروجيني (ar)
acid–base indicator
https://doi.org/10.1351/goldbook.A00075
An acid or base which exhibits a colour change on neutralization by the basic or acidic @T06386@ at or near the @T06387-1@ of a @T06387-2@.
Source:
Orange Book, 2nd ed., p. 48 [
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