Acid-Base Indicator Transition Ranges Indicator ... - EHSRMS

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This document provides a listing of various acid base indicators and their respective pH transition points. This list is not comprehensive and information may have changed. Acid-Base Indicator Transition Ranges

INDICATOR

TRANSITION pH

COLOR CHANGE

Acid Fuchsin

12.0 to 14.0

RED → COLORLESS

Alizarin

5.8 to 7.2

YELLOW → RED

Alizarin

11.0 to 13.0

RED → PURPLE

Brilliant Yellow

6.6 to 7.8

YELLOW → RED

Bromocresol Green

3.8 to 5.4

YELLOW → BLUE

Bromocresol Green Sodium salt

3.8 to 5.4

YELLOW → BLUE

Bromocresol Purple

5.2 to 6.8

YELLOW → PURPLE

Bromocresol Purple Sodium salt

5.2 to 6.8

YELLOW → PURPLE

Bromophenol Blue

3.0 to 4.6

YELLOW → BLUE

Bromophenol Blue Sodium salt

3.0 to 4.6

YELLOW → BLUE

Bromothymol Blue

6.0 to 7.6

YELLOW → BLUE

Bromothymol Blue Sodium salt

6.0 to 7.6

YELLOW → BLUE

Chlorophenol Red

5.2 to 6.8

YELLOW → RED

12.2 to 13.2

YELLOW → AMBER

Congo Red

3.0 to 5.0

BLUE → RED

m-Cresol Purple

1.2 to 2.8

RED → YELLOW

m-Cresol Purple

7.4 to 9.0

YELLOW → PURPLE

Cresol Red

0.0 to 1.0

RED → YELLOW

Cresol Red

7.0 to 8.8

YELLOW → VIOLET RED

Crystal Violet

0.0 to 1.8

YELLOW → BLUE

Curcumin or Tumaric

7.4 to 8.6

YELLOW → RED

Diphenylcarbazone – Bromophenol Blue

3.0 to 7.0

YELLOW → BLUE

Ethyl Orange

3.4 to 4.8

RED → YELLOW

Ethyl Red

4.0 to 5.8

COLORLESS → RED

Ethyl Violet

0.0 to 2.4

YELLOW → BLUE

Clayton Yellow

5,5’-Indigodisulfonic Acid Disodium salt

11.4 to 13.0

BLUE → YELLOW

Malachite Green

0.2 to 1.8

YELLOW → BLUE GREEN

Methyl Green

0.2 to 1.8

YELLOW → BLUE

Methyl Orange

3.2 to 4.4

RED → YELLOW

Methyl Orange Sodium salt

3.2 TO 4.4

RED → YELLOW

Methyl Orange – Xylene Cyanole

3.2 TO 4.2

PURPLE → GREEN

Methyl Red

4.2 to 6.2

PINK → YELLOW

Methyl Red Hydrochloride

4.2 to 6.2

PINK → YELLOW

Methyl Red Sodium salt

4.2 to 6.2

PINK → YELLOW

Methyl Violet

0.0 to 1.6

YELLOW → BLUE

Neutral Red

6.8 to 8.0

RED → AMBER

m-NItrophenol

6.8 TO 8.6

COLORLESS → YELLOW

Phenolphthalein

8.0 to 10.0

COLORLESS → RED

Phenol Red

6.8 TO 8.2

YELLOW → RED

Phenol Red Sodium salt

6.8 TO 8.2

YELLOW → RED

Quinaldine Red

1.4 to 3.2

COLORLESS → RED

Resazurin

3.8 to 6.4

ORANGE → VIOLET

Resorcin Blue

4.4 to 6.2

RED → BLUE

Rosolic Acid

5.0 to 8.0

YELLOW → RED

Thymol Blue

1.2 to 2.8

RED → YELLOW

Thymol Blue

8.0 to 9.2

YELLOW → BLUE

Thymol Blue Sodium salt

1.2 to 2.8

RED → YELLOW

Thymol Blue Sodium salt

8.0 to 9.2

YELLOW → BLUE

Thymolphthalein

8.8 to 10.5

COLORLESS → BLUE

LAST UPDATE

8/8/2014 11:27:45 AM