[ IN-33 ] PHENOLTHYMOLPHTHALEIN

Transition Range

pH8.4– pH11.0 colourless to violet

Solution Clarity (Ethanol)

Conforms

Sulfated ash

≤ 0.1%

[ IN-34 ] 1-(2 -PYRIDYLAZO)- 2 -NAPHTHOL                                                                 CAS-No. 85-85-8

Chemical Formula

C₁₅H₁₁N₃O

Molecular Weight

249.27

≥ 90%

138–142°C(2 °C )

Conforms

Suitability as indicator(for metal titration)

Conforms

Sulfated ash

≤ 0.1%

Solution Clarity (Ethanol)

pass

Chemical Formula

C₁₉H₁₄O₃

Molecular Weight

290.32

Melting Point

220 °C

Transition Range

pH6.8– pH8.0 orange to red

Sensitive

Conforms

50% Ethanol Solution Clarity

Conforms

Sulfated ash

≤ 0.25%

[ IN-36 ] SEMIXYLENOL ORANGE

Chemical Formula

C₂₄H₂₃NNa₂O₉S

Molecular Weight

547.52

Content ( Spectrophotometric )

≥ 80.0%

Sensitivity

Conforms

Solution clarity (water)

Conforms

Sulfated ash

≤ 24%

Water

≤ 10%

[ IN-37 ] THYMOL BLUE                                                                                                    CAS-No. 76-61-9

Chemical Formula

C₂₇H₃₀O₅S

Molecular Weight

466.60

1 st Transition Range

pH1.2 – 2.8pH violet red to brownish yellow

2 nd Transition Range

pH8.0 – 9.6pH greenish yellow to blue

Absorption rate of quality L/cm.g:

≥ 71.0

Solution Clarity (Ethanol)

Conforms

≤ 0.3%

[ IN-38 ] THYMOL BLUE SODIUM SALT                                                                   CAS-No. 62625-21-2

Chemical Formula

C₂₇H₂₉N a O₅S

Molecular Weight

488.57

1 st Transition Range

pH1.2 – 2.8pH violet red to brownish yellow

2 nd Transition Range

pH8.0 – 9.6pH greenish yellow to blue

Solution Clarity

Conforms

≤ 15%