標題:
about reactions and the colour change
發問:
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Please write the equation and the colour change when Iron(lll)chloride is addedinto the following chemicals: 1.KCNS 2.KNO3 3.C6H60/PhOH 4.CH3COONa 5.Na2S 6.K3Fe(CN)6 7.NaOH 更新: 2.AgNo3 更新 2: 4.醋酸(Na)
最佳解答:
1. The colourless solution of KCNS turns deep red. Fe2+(aq) + CNS-(aq) = [FeCNS]2+(aq) (reversible reaction) 2. There is no reaction. 3. The colourless solution of phenol turns violet. Fe3+(aq) + 3C6H5OH(aq) → [Fe(OC6H5)3](aq) + 6H+(aq) 4. There is no reaction. 5. A black precipitate is formed. 2Fe3+(aq) + 3S2-(aq) → Fe2S3(s) 6. No information about the reaction between FeCl3 and K3[Fe(CN)6] is found. However, FeCl3 reacts with K4[Fe(CN)6] to give a deep blue precipitate (called Prussian blue). Fe3+(aq) + [Fe(CN)6]4-(aq) → Fe4[Fe(CN)6]3(s) 7. A reddish brown precipitate is formed. Fe3+(aq) + 3OH-(aq) → Fe(OH)3(s)
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