Complexes fy HEMISTRY GEOLOGICAL IITED Secretary GEOLOGICAL Director For CONTENTS Page Abstract precipitation and or ILLUSTRATIONS Page FIGURE TABLES Page 500 rat CHEMISTRY COMPLEXES ID: 189965
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Complexes fy :HEMISTRY GEOLOGICAL IITED UNITED INTERIOR Secretary GEOLOGICAL Director For CONTENTS Page Abstract. precipitation and or ILLUSTRATIONS Page ^FIGURE TABLES Page 500 rat CHEMISTRY COMPLEXES TANNIC By ABSTRACT Solutions tannic with ACKNOWLEDGMENTS The ORGANIC Iron litera determination 75 76 able inorganic by polar in used single :Fe(C is forms CHOHCOO which COMPLEXES Citric earlier ferric or TANNIC ACID Tannin types molecule HO The 78 of solutions aliphatic PROPERTIES The C which T~ This DISSOCIATION A COMPLEXES 79 The happen (K~W~indicate the REDUCING Gallic reducing action solution tannic LABORATORY In 539703 60 2 80 solution An The concentrations the The as bottles except ANALYTICAL The COMPLEXES When the CHEMICAL Results 82 CHEMISTRY TABLE Effect [Eh No Ini 2.0 Odays PH Fe+s 2 pH Fe« 6.8 5 Ini 2.0 Odays 2.0 Fe« 5.0 Fe+3 1.3 Fe« 7.0 2 1.9 50 Ini 5.0 0 2.0 1 3.1 TABLE Effect [Eh Ini Observation Time 0 Fe+2 9.4 Observation 3 Fe+2 10 Fe+s 0.0 9.2 9.8 Observation 7 Eh 0.65 COMPLEXES IRON on In 5 2.0 Fe« 2.2 Fe+2 1.6 30 1.4 tannic 5 4.3 Fe« 4.0 Fe+» 1.4 6 1.7 Fe« 9.0 Fe« 1.2 15 1.9 Fe« 9.5 Fe« 0.30 tannic 6 2.0 Fe« .08 9 2.0 Fe« 0.00 15 2.1 30 1.5 Eh .544 aged in Observation Fe+a 6.2 p 4.5 Observation 31 It 13. p 5.4 Fe« 0.0 84 NO Evidently, for iron initial pH ferric FIVE A as result break made as pH COMPLEXES form iron, FIFTY A the made. 3, represent tannic 86 FIVE A solutions pH filtrate tannic COMPLEXES The K for K obtained BATE The tannic may upward 88 CHEMISTRY 10.0 K z: cr LU O. �c/ a. H LU O o o J-* o ^ _J R 0.01 Notannicacid 04 28 FIQUEE very STABILITY The However, COMPLEXES 89 78) T~this K is 10.0 b z: _i QL LU Q. CSL CSL o o 0 z: CSL I 0.01 *^.R2L°ItannJcacid 24 FIGURE Iron at 6.0. Initial 90 CHEMISTRY If The Kfor Kfor Kgiven Kis [Bp] Solving K Values U [H+'J and Kfoimula, _[TFe-»][H-H][Bppg Activity added, COMPLEXES tannic Kcan = Essentially K The Kthus Kdoes COMPARISON Eh ,,, where n is The A. In iron for 92 CHEMISTRY Measured computed pH No acid 2.0 5 2.0 50 2.0 500 2.0 i A of values for ratio COMPLEXES The ferrous results complexing ACTION The be 94 CHEMISTRY slow or solutes LITERATURE Bjerrum, Sci. D., E. and o