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[1][2][3] or in methanol.[4]

Tashiro's indicator (pH indicator)
below pH 4.4 above pH 6.2
4.4 6.2

It can be used for the titration of ammonia in Kjeldahl analysis.

Colours

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Methylene blue functions to change the red-yellow shift of methyl red to a more distinct violet-green shift.

See also

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References

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  1. ^ Willmes, Arnold (2007). Taschenbuch Chemische Substanzen. Frankfurt am Main. ISBN 978-3817116621.{{cite book}}: CS1 maint: location missing publisher (link)
  2. ^ Tashiro’s indicator solution in ethanol
  3. ^ SDS
  4. ^ Tashiro’s indicator solution in methanol