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alkali

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alkali


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Alkali  \Al"ka*li\,  n. 
  Soluble  mineral  matter,  other  than  common  salt,  contained  in 
  soils  of  natural  waters.  [Western  U.  S.] 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Alkali  \Al"ka*li\  (?;  277),  n.;  pl  {Alkalis}  or  {Alkalies}.  [F. 
  alcali  ultimately  fr  Ar  alqal[=i]  ashes  of  the  plant 
  saltwort,  fr  qalay  to  roast  in  a  pan,  fry.] 
  1.  Soda  ash;  caustic  soda,  caustic  potash,  etc 
 
  2.  (Chem.)  One  of  a  class  of  caustic  bases,  such  as  soda, 
  potash,  ammonia,  and  lithia,  whose  distinguishing 
  peculiarities  are  solubility  in  alcohol  and  water,  uniting 
  with  oils  and  fats  to  form  soap,  neutralizing  and  forming 
  salts  with  acids,  turning  to  brown  several  vegetable 
  yellows,  and  changing  reddened  litmus  to  blue. 
 
  {Fixed  alkalies},  potash  and  soda. 
 
  {Vegetable  alkalies}.  Same  as  {Alkaloids}. 
 
  {Volatile  alkali},  ammonia,  so  called  in  distinction  from  the 
  fixed  alkalies. 
 
  From  WordNet  r  1.6  [wn]: 
 
  alkali 
  n  1:  any  of  various  water-soluble  compounds  capable  of  turning 
  litmus  blue  and  reacting  with  an  acid  to  form  a  salt  and 
  water;  "bases  include  oxides  and  hydroxides  of  metals 
  and  ammonia"  [syn:  {base}] 
  2:  a  mixture  of  soluble  salts  found  in  arid  soils  and  some 
  bodies  of  water;  detrimental  to  agriculture 




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