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.