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Updated: May 20, 2025
This indicator cannot, however, be successfully used with weak bases, even ammonium hydroxide; for, since it is weak acid, the salts which it forms with weak alkalies are easily hydrolyzed, and as a consequence of this hydrolysis the change of color is not sharp. This indicator is affected by even so weak an acid as carbonic acid, which must be removed by boiling the solution before titration.
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