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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Tashiro's indicator | 1/1 | https://en.wikipedia.org/wiki/Tashiro's_indicator | reference | science, encyclopedia | 2026-05-05T11:30:05.843942+00:00 | kb-cron |
Tashiro's indicator is a pH indicator (pH value: 4.4–6.2), mixed indicator composed of a solution of methylene blue (0.1%) and methyl red (0.03%) in ethanol or in methanol.
It can be used for the titration of ammonia in Kjeldahl analysis.
== Colours == In acids: violet At equivalence point (pH 5.2): grey In bases: green Methylene blue functions to change the red-yellow shift of methyl red to a more distinct violet-green shift.
== See also == Litmus pH Indicator
== References ==