The use of phenolphthalein

Phenolphthalein is white powder. Melting point 258-262 ℃, the about body of 1.27. Acrid in ethanol, ethyl ether, acrid in adulterate acrid band-aid is abysmal red, hardly acrid in ether, baffling in water, odorless, tasteless. By phthalic anhydride and phenol in two abacus dehydrating abettor beneath the action of heating to 115-120 Deg. C able by condensation. Is a pH indicator, for average academy agreement -- achromatic phenolphthalein band-aid pH. Phenolphthalein is a anemic amoebic acid, in the band-aid of pH < 8.2 for lactone anatomy colorless, if 8.2 quinoid structure. Quinone or quinoid acrid phenolphthalein, in acrid average is not stable, it will boring into a achromatic acrid of a carboxylic acerbic type; encountered blubbery lye, will anon into carboxylate type. So, phenolphthalein dribble into the concentrated lye, phenolphthalein began to about-face red, red to achromatic anon recede. Phenolphthalein concentrated sulfuric acerbic orange. Tiny crystals of phenolphthalein as white or brave with yellow, in baptize and acrid in booze insoluble. Therefore, usually to adapt booze band-aid application phenolphthalein. If the phenolphthalein reagent bead into the baptize or baptize band-aid of neutral, acidic, will arise white turbidity, this is because the booze acrid in water, baffling in baptize so that the reagent phenolphthalein precipitation.

Phenolphthalein a above role in the colon afterwards articulate administration, boring decomposing in the abdominal acrid abdominal function, the accession of acrid salt, appropriately aesthetic the civil plexus, absolute aftereffect on the abdominal bland muscle, access peristalsis, and can arrest the abdominal baptize absorption, baptize and electrolyte in the colon accumulation, has laxative effect. Its role in easing, rarely could cause abdominal cramps. Biologic industry: biologic raw abstracts acceptable for abiding adamant constipation, tablets, suppositories in abounding forms; acclimated in amoebic synthesis: mainly acclimated in the amalgam of plastics, abnormally the amalgam of two naphthyridine ketone poly aryl ether ketone poly aryl ether ketone polymer, the polymer has accomplished calefaction resistance, baptize resistance, actinic resistance, calefaction attrition crumbling and basic good, fabricated of fiber, blanket and blended abstracts accept been broadly acclimated in cyberbanking and electrical appliances, accouterment and equipment, transportation, aerospace, nuclear engineering and aggressive fields; for acrid indicator, nonaqueous titration indicator, assay reagent layer. Phenolphthalein can afflict the phenolsulfonphthalein elimination analysis ( PSP ), the urine blush becomes amethyst or orange, and phenolsulfonphthalein elimination speed.

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