inorganic ions

• whats the method to test for a carbonate ion?

  • add hydrochloric acid
  • transfer gas into calcium hydroxide (limewater)
• what are the observations of the carbonate test?

  • fizzing
  • limewater turns cloudy
• whats the ionic equation for the carbonate test?

  CO3 + 2H > CO2 + H2O
• whats the method to test for sulphate ions?

  • add dilute hydrochloric acid
  • add barium chloride solution
• what are the observations of the sulphate test?

  white precipitate formed
• whats the ionic equation of the sulphate test?


  Ba2+ SO4 > BaSO4
• Whats the method to test for group 2 ions ?

  add sodium hydroxide solution
• what are the observations of the test for group 2 ions?

  white precipitate is formed
• what are the ionic equations for testing for group 2 ions?

  Mg2+ + 2OH- > Mg(OH)2

  
  

  Ca2+ +2OH- > Ca(OH)2
• Whats the method to test for ammonium ions?

  • add sodium hydroxide solution
  • add ammonium chloride
  • warm gently in a water bath
• what are the observations for the ammonium test?

  litmus paper turns blue
• whats the ionic equation for testing for ammonium ions?

  NH4+ + OH- > NH3+ H2O
• whats the method for testing hydroxide ions?

  • add sodium hydroxide solution into 2 test tubes
  • ass universal indicator solution into 1 and phenolphthalein solution into the other
• what are the observations when testing for hydroxide ions?

  • phenolphthalein solution turned pink
  • universal indicator turned blue