Tests for Anions Chloride Sulfate/sulfite carbonate/hydrogen carbonate

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Presentation transcript:

Tests for Anions Chloride Sulfate/sulfite carbonate/hydrogen carbonate nitrate phosphate (NB know confirmatory test too!)

Chloride Add AgNO3 Get white ppt Confirm = ppt dissolves in dilute ammonia Equation needed

Sulfate/sulfite Add BaCl2 Get white ppt Distinguish add dil HCl to white ppt ppt remains = sulfate ppt dissolves = sulfite Equation needed !!

CO32- /HCO3- Add dil. HCl (or any acid) Get bubbles of CO2 (limewater milky) Distinguish add MgSO4 to fresh solution white ppt. immediately = carbonate white ppt on heating = hydrogen carbonate Equation needed !!

Nitrate Brown Ring Test Add fresh FeSO4 At slant add conc. H2SO4 drop wise Get brown ring at junction of 2 layers No equation needed

Phosphate Add ammonium molybdate 5 drops of conc. nitric acid (warm the solution) Get yellow ppt No equation needed Confirm: Goes colourless when add dilute NH3

Questions You add ammonium molybdate when testing for ? Phosphates You add silver nitrate when testing for ? Chlorides You use Magnesium sulfate for? Distinguishing between carbonates and hydrogencarbonates (white ppt formed immediately means carbonate)

Questions BaCl2 is used to test for which two anions? Sulfates and sulfites You add conc.nitric acid when testing for ? phosphates You add dilute HCl in which 4 anion tests Gives CO2 with both carbonates and hydrogencarbonates As distinguishing test for sulfates and sulfites – both gave white ppt with BaCl2 (sulfate – ppt unchanged)

Questions AgNO3 is used to test for ? Chloride You add conclusion can you draw if a white ppt forms when BaCl2 is added to a solution ? Solution is either a sulfate or sulfite What is the confirmatory test for phosphates? The yellow ppt(from addition of ammonium molybdate, conc HNO3 and gentle heating ) dissolves in dilute ammonia solution (NH4OH)