chem notes 10-05

chem notes 10-05 - -AB/EB/AF causing...

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October 5, 2007 Dr. Stevens Gen. Chem. 1 Review: CN- + MnO4- CNO- + MnO2 CN- CNO- CN- + H2O CNO- CN- + H2O CNO- + 2H+ CN- + H2O CNO- + 2H+ + 2e- 3 CN- + 3 H2O 3 CNO- + 6 H+ + 6 e- MnO4- MnO2 MnO4- MnO2 + 2H2O MnO4- + 4H+ MnO2 + 2H2O MnO4- + 4H+ + 3e- MnO2 + 2H2O 2 MnO4- + 8 H+ + 6 e- 2 MnO2 + 4 H2O 3CN- + 3H2O + 2MnO4- + 8H + 6e- 3CNO- + 6H + 6e- + 2MnO2 + 4H2O 3CN- +2MnO4- + 2H+ 3CNO- + 2MnO2 + H2O Basic Reaction: H+ + OH- H2O 3CN- + 2MnO4- + 2H+ 3CNO- + 2MnO2 + H2O + 2OH- + 2OH- 2H2O - H2O - H2O 3CN- + 2MnO4- + H2O 2MnO2 + 3CNO- + 2OH- Precipitation Reactions: -NO charge change -solid formed -solid = precipitate -pptn = precipitation – rules are entirely empirical -Demo: -AB + CD green solid ppt => AB + CD AD + BC -EB + CD blue solid ppt => EB + CD ED + BC -AF + CD green solid ppt => AF + CD AD + FC -AF + CB no ppt forms
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Unformatted text preview: -AB/EB/AF causing precipitation-Anions:-makes solids readily D-makes soluble solutions B, F-Cations:-always soluble C-other E, A-Empirical Rules:-Cations:-always soluble: alkali metals, ammonium ion-other: follows rules of anion theyre with-Anions:-generally soluble:-nitrate (NO3-)-chlorate (ClO3-)-chloride (Cl-)-bromide (Br-)-iodide (I-)-sulfate (SO4-2)-generally insoluble:-hydroxide (OH-)-carbonate (CO3-2)-phosphate (PO4-3)-sulfide (S-2)-Examples:-NaOH(s) H2O Na+(aq) + OH- (aq)-Fe(OH)3(s) H2O Fe(OH)3(s)-Mixing Salt Solutions:-Na2CO3(aq) + MgCL2(aq) 2NaCl(aq) + MgCO3(s)-all (aq) are separated to show ions-2Na+ + CO3-2 + Mg+2 + 2Cl- 2Na+ + 2Cl- + MgCO3(s)-remove spectator ions those not involved in creating ppt-CO3-2 + Mg+2 MgCO3(s)...
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This note was uploaded on 04/23/2008 for the course CH 151 taught by Professor Stevens during the Fall '08 term at Whitworth University.

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chem notes 10-05 - -AB/EB/AF causing...

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