Tashiro's_indicator

Tashiro's indicator

Tashiro's indicator

pH indicator

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 e.g. for the titration of ammonia in Kjeldahl analysis.

Colours

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

See also

References

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