EXP 18

avatar
Created by
Gian

Cards (15)

  • Soda ash is a technical anhydrous sodium carbonate
  • It is likely to contain from a small to moderate amounts of impurities such as chlorides and hydroxides.
  • Some of these impurities, notably the hydroxide, combined with acids, contribute to the total alkaline strength of the ash so that a simple titration analysis like the following does not necessarily give the true percentage of sodium carbonate but merely expresses the total alkalinity in terms of percent (%) Na2CO3.
  • The analysis of soda ash is chosen merely as a typical alkalimetric process.
  • Pearl ash (K2CO3)
  • Limestone (CaCO3)
  • Quicklime (CaCO3)
  • Washing soda (Na2CO3.10H2O)
  • Caustic Soda (NaOH)
  • Caustic potash (KOH)
  • Milk of Magnesia [suspension of Mg(OH)2]
  • household ammonia (NH3)
  • strong alkali is titrated with a strong acid (alkalimetry)
  • the indicators to be used are either: Methyl orange (M.O.) or Methyl Red (M.R.)
  • Phenolphthalein and most other indicators are affected by the carbonic acid liberated in the reaction, which causes a change in color before the reaction is complete.