Qualitative Analysis of Common Anions

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Experiment Number 1 Title: Qualitative Analysis of Common Anions Lecturer’s Name: Dr. Anne Student’s Name: Lee Hun Wei Partner’s Name: Ho Wenn Qian Section: A Date of Experiment: 17th of January 2013 Aim: To resolve the chemical properties and physical properties of the anions and to gain experience through separating and identifying the presence of a particular anion. Procedure: “Please Refer to the Laboratory Manual” Results: Procedure Number and Ion 1) Chemical(s) Test Reagent or Technique Evidence of Chemical Change Responsible for Observation NH3 White Precipitation Ba(NO3)2 Ba2+(aq) +SO42→BaSO4(s) Equation(s) for Observed Reaction 2) Centrifuging The precipitation and supernatant are seperated - - 3) SO42- HNO3 White precipitate does not dissolve BaSO4 Ba2+(aq)+SO42(aq)BaSO 4(aq) 4) PO43- Warm Water Bath at 60oC Yellow Precipitate (NH4)6Mo7O24 HPO42-(aq) +12(NH4)2MoO4(aq) +23H+(NH4)3PO4(MoO3) 12(s)+ 21NH4+ +12H2O 5) CO32- HNO3 Milky Solution Ca(OH)2 CO2(g)+2H2O-(aq) CO32(aq)+H2O(l), CO32-(aq) +Ca2+CaCO3 6) S2- HNO3 Precipitation Cu(NO3)2 Cu2+(aq)+S2-(aq) CuS(s) 7) I- Adding Toluene to observe the color change Purple Iodine Fe(NO3)3 2Fe3+(aq)+2I-(aq) 2Fe2+(aq)+I2 2MnO4-(aq)+10Br(aq)+16H+(aq) 2Mn2+(aq)+5Br2+8H20 8) Br- HNO3 Appearance of Brown Bromine KMnO4 9) Cl10) HNO3 NH3 White Precipitate Ammonia dissolves the precipitate AgNO3 AgNO3 Cl-(aq)+Ag+(aq)AgCl(s) AgCl(s)+2NH3(aq)[Ag (NH3)2]+(aq)+Cl-(aq) 11) NaOH Precipitation Ag2SO4 - 12) NO3- Brown Ring Test Brown Ring Concentrated Sulfuric Acid NO3(aq)+3Fe2+(aq)+4H+(a q)3Fe3+(aq)+NO(aq)+2 H2O(l) Conclusion: Through the results shown above we can conclude that each anion has different distinctive properties, and with these properties we
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