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PHENOLPHTHALEIN

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Product Detailed

Related Categories:Chemical Reagents

White to yellowish crystalline powder ACS GRADE HIGH PURITY

PHENOLPHTHALEIN
PRODUCT IDENTIFICATION
CAS NO.	77-09-8
EINECS NO.	201-004-7
FORMULA	C20H14O4
MOL WT.	318.33
H.S. CODE
TOXICITY
SYNONYMS	Fenolftaleina; Phénolphtaleine;
3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone; Phthalimetten; 3,3-Bis(4-hydroxyphenyl) Phthalide; alpha, alpha.-Di(p-hydroxyphenyl)phthalide; Dihydroxyphthalophenone; Fenolftalein; 3,3-Bis(4-hydroxyphenyl)-2-benzofuran-1(3H)-one;
DERIVATION
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE	White to yellowish crystalline powder
MELTING POINT	258 - 263 C
BOILING POINT
SPECIFIC GRAVITY	1.30
SOLUBILITY IN WATER	Insoluble
SOLVENT SOLUBILITY	Soluble in alkalies, chloroform. Dissolved in alcohol
AUTOIGNITION
pH
VAPOR DENSITY
AUTOIGNITION
NFPA RATINGS
REFRACTIVE INDEX
FLASH POINT
STABILITY	Stable under ordinary conditions
GENERAL DESCRIPTION & APPLICATIONS
The relationship between the activity of hydrogen ions [exactly hydronium ions, H(H2O)n+] and concentration of a solution is fundamentally important to determine the extent of a chemical reaction, as it affects the equilibria and kinetics of a wide variety of chemical and biochemical reactions. The hydrogen-ion activity refers to the effective concentration of unassociated hydrogen ions, the form that directly affects physicochemical reaction rates and equilibria. The symbol, pH, numerically relates the hydrogen ions concentration or activity. The pH is approximately equal to the negative logarithm of H+ concentration expressed in molarity. pH 7 is neutral; above it alkalinity increases and below it acidity increases. pH indicators are usually weak acidic or basic organic tautomers which exist in more than one structural form of which at least one form is characteristically colored in relation to different electronic configuration of the bound. Indicators should not change color exactly at one pH value, but within a wide pH range. The transition point of an indicator is defined as the point at which the acid and alkaline forms of the indicator exist in equal concentrations. Visual transition intervals are as below: alpha-Naphthol phthalein (CAS #: 596-01-0): from pH 7.3 (pinkish-yellow) to pH 8.7 (greenish-blue)Bromocresol green (CAS #: 76-60-8): from pH 3.8 (yellow) to pH 5.4 (blue)Bromcresol Purple (CAS #: 115-40-2): from pH 5.2 (yellow) to pH 6.8 (purple) Bromochlorophenol Blue (CAS #: 2553-71-1): from pH 3.2 (yellow) to pH 4.8 (blue) Bromocresol purple, sodium salt (CAS #: 62625-30-3): from pH 5.2 (yellow) to pH 6.8 (purple)Bromophenol blue (CAS #: 115-39-9): from pH 3.0 (yellow) to pH 4.6 (blue) Bromophenol blue, sodium salt (CAS #: 62625-28-9): from pH 3.0 (yellow) to pH 4.6 (blue) Bromopyrogallol Red (CAS #: 16574-43-9): suitable for complexometric or chelometric titrations Bromothymol blue (CAS #: 76-59-5): from pH 6.0 (yellow) to pH 7.6 (blue) Bromothymol blue, sodium salt (CAS #: 34722-90-2): from pH 6.0 (yellow) to pH 7.6 (blue)Bromoxylenol Blue (CAS #: 40070-59-5): from pH 6.0 (yellow) to pH 7.6 (blue) Chlorophenol Red, water soluble (CAS #: 123333-64-2): from pH 4.6 (yellow) to pH 7.0 (purple) Cresol Red (CAS #: 1733-12-6): from pH 7.0 (orange) to pH 8.8 (purple) Fluorescein (CAS #: 2321-07-5)Fluorescein sodium (CAS #: 518-47-8):Glycinethymol Blue (CAS #: 3810-63-7): Iodophthalein sodium (CAS #: 2217-44-9) m-Cresol purple (CAS #: 2303-01-7): from pH 7.4 (yellow) to pH 9.0 (purple) Methylthymol blue, sodium salt (CAS #: 1945-77-3): suitable for complexometric or chelometric titrations o-Cresolphthalein (CAS #: 596-27-0): from pH 8.2 (colorless) to pH 9.8 (red)o-Cresolphthalein Complexone (CAS #: 2411-89-4): suitable for complexometric or chelometric titrationsPhenolphthalein Complexone (CAS #: 25296-54-2): Phenol Red (CAS #: 143-74-8): from pH 6.8 (yellow) to pH 8.2 (red) Phenol Red Sodium Salt (CAS #: 34487-61-1): from pH 6.8 (yellow) to pH 8.2 (red)Phenolphthalein (CAS #: 77-09-8): from pH 8.5 (colorless) to 9.0 (red)p-Xylenol Blue (CAS #: 125-31-5): Acid range: from pH 1.2 (red) to pH 2.8 (yellow)Alkali range: from pH 8.0 (yellow) to pH 9.6 (purplish-blue)Pyrocatechol violet (CAS #: 115-41-3): suitable for determination of many metals (complexometric or chelometric titrations) particularly rapid for tin Pyrogallol Red (CAS #: 32638-88-3):Thymol Blue, sodium salt (CAS #: 62625-21-2): Acid range: from pH 1.2 (red) to pH 2.8 (yellow)Alkaline range: from pH 8.0 (yellow) to pH 9.2 (blue)Thymolphthalein Complexone (CAS #: 1913-93-5): suitable for complexometric or chelometric titrations Thymolphthalein (CAS #: 125-20-2): from pH 8.8 (colourless) to pH 10.5 (blue) Phthalein is the moiety in a dye which shows color changes depend on particular hydrogen ion concentrations. Certain phthaleins (e.g. phenolphthalein) have a cathartic action.
SALES SPECIFICATION
APPEARANCE	White to yellowish crystalline powder
DYE CONTENT	98.0% min
LOSS ON DRYING	1.0% max
RESIDUE ON IGNITION	0.1% max
TRANSITION INTERVAL	pH 8. 0to colourless, pH 10.0 to red-violet
HEAVY METALS	10ppm max
TRANSPORTATION
PACKING
HAZARD CLASS
UN NO.
OTHER INFORMATION
Hazard Symbols: XN, Risk Phrases: 22-40, Safety Phrases: 36/37-45