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Product Description | Product Application | Product Notes| Product DOSE
1-NAPHTHOLPHTHALEIN  excellent quality manufacturer, exporter and supplier. 1-Naphtholphthalein (C28H18O4) is a pH indicator with a visual transition from colorless/reddish to greenish blue at pH 7.3 – 8.7.   
Other Equivalent Brand

Naphtholphthalein pH Indicator solid

Short Description:
pH Indicator pH 7.3 colorless to reddish; 8.7 greenish to blue

pH Indicator manufacturer and supplier. Ready available stock of 1NAPHTHOLPHTHALEIN in various size and packing enable us to full fill demand of our regular customer with immediate effect. 1NAPHTHOLPHTHALEIN available in Mumbai, Kandla - Gandhidham, Surat, Visakhapatnam, Chennai, Kolkata - INDIA, Fujairah - Dubai, Middle East UAE.

As indicator in 0.1% or 0.04% solution in alcohol. pH 7.3 colorless to reddish; 8.7 greenish to blue. Particularly adapted for weak acids in strong alcoholic solution.
Using Procedure:
pH 7.1 - pH 8.3 pink brownish - blue Storage of liquid indicator : storage temp. Store below +30°C.solubility Solubility Practically insoluble in water; soluble in ethanol 
Molar mass: 418.45 g/mol Appearance: Colorless-reddish to blue-green solid Chemical formula: C28H18O4 Solubility in water: Insoluble   Solubility in water: InsolubleMolar mass: 418.45 g/mol Appe [+] Read More...
Technical Specifications:
C.A.S. No. 596-01-0,
Physical State : Black Powder
Insoluble in water
M.F. C28H18O4
M.W. 418.45gm/mole


Solubility 0.1 % (95% EtOH) Almost Clear solution
Absorption maximum (in 0.1N NaOH) ?max 650-654nm
Absorptivity 1%/1cm (in 0.1N NaOH) at ?max >650
Loss On Drying (110°C) <3%
Melting Point Range 238-240 °C(lit.)

Range7.1(brownish)-8.3(blue/green) Water Solubility  Insoluble in water. Soluble in ethanol.

HS CODE : 32049000
Packing Size:
1.00 Grams
Available Packing Size:
1 Gram, 5 Gram, 50 Gram bottle available on factory sale price.
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