NEUTRAL RED 75% (pH INDICATOR) (C. I. NO. 50040)*

NEUTRAL RED 75% (pH INDICATOR) (C. I. NO. 50040) NEUTRAL RED 75% (pH INDICATOR) (C. I. NO. 50040)
Article No. Grade Purity Cas no. Molecular Formula Molecular Weight H.S. Code Shelf Life
N0142200025 pH INDICATOR 75% 553-24-2 C15H17ClN4 288.78 3204.9000
60 Months

Physical Properties

Physical state at 20 °C

Solid

Colour

Dark green powder

Odour

Odorless

pH value

3.1

Melting Point/ Freezing point [°C]

290 °C

Solubility in water [% weight]

Soluble in water

Specifications

Appearance:

 Dark green powder

Loss on dryig (at 110°C):

 Min 12%

Dye content (by spectrophotometry):

 Min 75%

Absorption maxima (50% ethanol + 2 ml acetic acid):

 539 - 544 nm

Absorptivity (A 1%/1cm; at lmax; in 50% ethanol + 2 ml acetic acid):

 Min 900

Solubility (0.1% in 50% ethanol):

 Clear solution

Transition range (pH 6.8 - 8.0):

 Violet Red - Yellow
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Globally Harmonized System of classification and Labelling of Chemicals (GHS)

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