熔点258-263°C沸点417.49°C(roughestimate)密度1.299折射率1.5400(estimate)闪点24°C溶解度Solubleinalcohol.Slightlysolubleinether.Slightlysolubleindimethylsulfoxideandinsolubleinbenzeneorhexane.形态Solid酸度系数(pKa)9.4(at25℃)色指数764颜色Whitetoyellow-white气味(Odor)OdorlessPH值7.8～10.0酸碱指示剂变色ph值范围8.0(colorless)-10(Red)水溶解性<0.1g/100mL*波长(λmax)552nm,553nm,374nm,205nm,229nm,276nmMerck14,7243BRN284423稳定性Stable.Incompatiblewithstrongoxidizingagents,alkalies.主要应用Displaydevice,sensors,semiconductors,fuelcells,phoChemicalbooktoreceptors,electronicpackaging,authenticationsystemforsecuredocuments,inks,correctionfluid,paints,detectionofdefectsinfilms,floorcoatings,textiles,corrosiontesting,explosive,concrete,toys,detectinglipaseactivityofcropseeds,soaps,methodforpreventionofdrugmisuse,cosmetics,diapers,detectingviablecells,carbohydrates,antimalarial,treatingamyloid-associateddiseasesCAS数据库77-09-8(CASDataBaseReference)NIST化学物质信息Phenolphthalein(77-09-8)EPA化学物质信息3,3-Bis(4-hydroxyphenyl)phthalide(77-09-8)

酚酞是一种常见酸碱指示剂，在酸性溶液中呈无色，在碱液或碱金属的碳酸盐溶液中呈红色，但如果在浓碱溶液中则会生成无色的三金属盐，红Chemicalbook色褪去。鉴于此特性实验室中常用作酸碱滴定时的指示剂，变色范围PH值8.2～10.0，由无色变红。当酚酞试剂滴入水或中性、酸性的