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123yangyangl金虫 (著名写手)
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请问亚磷酸氢根离子HPO3-在碱性条件下和哪些金属离子能够生成沉淀
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Co11(HPO3)8(OH)6是钴离子在碱性条件你下和亚磷酸氢根离子生成的这种沉淀，那么镍离子也能生成这样的沉淀嘛？ Although H2PO2 is often used as a reducing reagent during chemical reactions due to its low potential in aqueous solutions, it also has a strong dismutation trend to produce PH3 and （HPO3)2-, especially in a basic medium: 3H2PO2-+ OH- = PH3 + 2(HPO3)2- + H2O (1) When no NaHCO3 was used, the pH of the system was 4.Herein, no product was obtained; after the pH was tuned by NaHCO3 to 7 or above 7, the dismutation reaction was accelerated. Thus, Ni12P5 or Co11(HPO3)8(OH)6 was synthesized. In the present work, the presence of Co2+ ions could promote the above dismutation reaction since they could react with produced (HPO3)2- ions in the basic system to form pink Co11(HPO3)8(OH)6 precipitates. Thus, PH3 produced in eqn (1) reacted with Ni2+ions to generate Ni12P5: 11Co2+ + 8(HPO3)2- + 6OH- = Co11(HPO3)8(OH)6 (2) PH3 + Ni2+ =Ni12P5 + H+ (3) 就是这个反应，我想问一下镍离子不会生成沉淀嘛？而且上面说了需要溶液ph调到中性附近，但不是需要在碱性的条件下才能反应生成Co11(HPO3)8(OH)6嘛，调到中性可以嘛？ |
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