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phthaleinmore about phthalein

phthalein


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Phthalein  \Phthal"e*in\,  n.  [See  {Phthalic}.]  (Chem.) 
  One  of  a  series  of  artificial  organic  dyes  made  as 
  condensation  products  of  the  phenols  with  phthalic  acid,  and 
  well  represented  by  phenol  phthale["i]n.  Their  alkaline 
  solutions  are  fluorescent. 
 
  {Phenol  phthalein},  a  white  or  yellowish  white  crystalline 
  substance  made  from  phthalic  acid  and  phenol.  Its  solution 
  in  alkalies  is  brilliant  red,  but  is  decolorized  by  acids, 
  and  as  this  reaction  is  exceedingly  delicate  it  is  used  as 
  an  indicator. 




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