Chem Note (英皇教育 A[1].Fung) HKCEE å¸&cedil

Chem Note (英皇教育 A[1].Fung) HKCEE å¸&cedil

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Common oxidizing agents o and reducing agents o 1. Oxidizing agents. O.A. undergo reduction . 7 . . O.A. lose oxygen / provide oxygen to other reagent. . . . O.A. gain electron(s) . . . . Oxidation numbers of O.A. decrease . . . Oxidizing agents . Half – equations 7 Observation / O.N. changes . / 7 1. Acidified potassium permanganate MnO 4 . + 8 H + + 5 e . Mn 2+ + 4 H 2 O Purple to colorless O.N. of Mn. +7 to +2 2. Acidified potassium dichromate 7 Cr 2 O 7 2 - + 14 H + + 6 e . 2 Cr 3+ + 7 H 2 O Orange to green O.N. of Cr. +6 to +3 3. Chlorine water . Cl 2 + 2 e . 2 Cl . Yellowish green to colorless 7 O.N. of Cl. 0 to - 1 4. Bromine . Br 2 + 2 e . 2 Br . Brown to colorless O.N. of Br. 0 to - 1 5. Iodine solution . I 2 + 2 e . 2 I . Brown to colorless O.N. of I. 0 to - 1 6. Silver nitrate solution Ag + + 1 e . Ag Silvery solid is formed. 7 O.N. of Ag. +1 to 0 7. Copper(II) sulphate solution . (II). Cu 2+ + 2 e . Cu Brown solid is formed. 7 O.N. of Cu. +2 to 0 8. Iron(III) sulphate solution . (III). Fe 3+ + e . Fe 2+ Brown to pale green 7 O.N. of Fe. +3 to +2 9. Concentrated sulphuric acid . 4 H + + SO 4 2 - + + 2 e . SO
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Chem Note (英皇教育 A[1].Fung) HKCEE å¸&cedil

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