browse words by letter
a b c d e f g h i j k l m n o p q r s t u v w x y z


  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Acid  \Ac"id\,  n. 
  1.  A  sour  substance. 
  2.  (Chem.)  One  of  a  class  of  compounds,  generally  but  not 
  always  distinguished  by  their  sour  taste,  solubility  in 
  water,  and  reddening  of  vegetable  blue  or  violet  colors. 
  They  are  also  characterized  by  the  power  of  destroying  the 
  distinctive  properties  of  alkalies  or  bases,  combining 
  with  them  to  form  salts,  at  the  same  time  losing  their  own 
  peculiar  properties.  They  all  contain  hydrogen,  united 
  with  a  more  negative  element  or  radical,  either  alone,  or 
  more  generally  with  oxygen,  and  take  their  names  from  this 
  negative  element  or  radical.  Those  which  contain  no  oxygen 
  are  sometimes  called  {hydracids}  in  distinction  from  the 
  others  which  are  called  {oxygen  acids}  or  {oxacids}. 
  Note:  In  certain  cases,  sulphur,  selenium,  or  tellurium  may 
  take  the  place  of  oxygen,  and  the  corresponding 
  compounds  are  called  respectively  {sulphur  acids}  or 
  {sulphacids},  {selenium  acids},  or  {tellurium  acids}. 
  When  the  hydrogen  of  an  acid  is  replaced  by  a  positive 
  element  or  radical,  a  salt  is  formed,  and  hence  acids 
  are  sometimes  named  as  salts  of  hydrogen;  as  hydrogen 
  nitrate  for  nitric  acid,  hydrogen  sulphate  for 
  sulphuric  acid,  etc  In  the  old  chemistry  the  name  acid 
  was  applied  to  the  oxides  of  the  negative  or 
  nonmetallic  elements,  now  sometimes  called  anhydrides.