Acid Base Indicators

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INDICATOR



pH RANGE



QUANTITY OF INDICATOR

PER 10 mL



ACID



ALKALINE


Thymol blue (A)*†


1.2-2.8


1-2 drop of of 0.1% solution in aq.


Red


Yellow


Methyl orange (B)


3.1-4.4


1 drop of 0.1% solution in aq.


Red


Orange


Bromphenol blue (A)†


3.0-4.6


1 drop of 0.1% solution in aq.


Yellow


Blue-Violet


Bromphenol green (A)†


4.0-5.6


1 drop of 0.1% solution in aq.


Yellow


Blue


Methyl red (A)†


4.4-6.2


1 drop of 0.1% solution in aq.


Red


Yellow


Bromcresol purple (A)†


5.2-6.8


1 drop of 0.1% solution in aq.


Yellow


Purple


Bromthymol blue (A)†


6.2-7.6


1 drop of 0.1% solution in aq.


Yellow


Blue


Phenol red (A)†


6.4-8.0


1 drop of 0.1% solution in aq.


Yellow


Red


Neutral red (B)


6.8-8.0


1 drop of 0.1% solution in 70% alc.


Red


Yellow


Thymol blue (A)†‡


8.0-9.6


1-5drops of 0.1% solution in aq.


Yellow


Blue


Phenolphthalein (A)


8.0-10.0


1-5 drops of 0.1% solution in 70% alc.


Colorless


Red


Thymolphthalein (A)


9.4-10.6


1drop of 0.1% solution in 90% alc


Colorless


Blue


A: Indicator of acid * For the acid range. B: Indicator of base ‡ For the alkaline range. † Sodium salt.

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