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Group V

Group V. The Soluble Group N a 2+ , K + , Mg 2+ ,NH 4 +. 目的 學習 第五族 陽離子的分離與確定，精練操作技術與原理應用。. 原理 Na 2+ , K + , Mg 2+ ,NH 4 + 四 種離子屬於易溶性之陽離子，無法依照第一到第四 族的 分析法，利用各種沉澱試劑使其產生特定鹽類的沉澱物，而與其 他陽 離子分離，再做個別確定。. Note (1) Na 3 Co(NO 2 ) 6 當日現配。 (2) 於 Na + 檢定中， 加入 醋酸鈾醯 鎂無沉澱可嘗試加熱或多加幾滴。. Group V:

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Group V

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  1. Group V The Soluble Group Na2+, K+, Mg2+,NH4+

  2. 目的 學習第五族陽離子的分離與確定，精練操作技術與原理應用。 原理 Na2+, K+, Mg2+,NH4+四種離子屬於易溶性之陽離子，無法依照第一到第四族的分析法，利用各種沉澱試劑使其產生特定鹽類的沉澱物，而與其他陽離子分離，再做個別確定。 Note (1) Na3Co(NO2)6當日現配。 (2) 於Na+檢定中，加入醋酸鈾醯鎂無沉澱可嘗試加熱或多加幾滴。

  3. Group V: 2滴 Mg2+, 2滴 NH4+, 4滴 Na+, 4滴 K+ Group V Mg (base by NaOH) + 1d6 M NH4Cl + 2~4d Na2HPO4 K + 1d6 M HOAc + 少量 NaNO3(s) ∆ +1dNa3Co(NO2)6 Na + > 6d 醋酸鈾醯鎂 靜置 靜置(5 min) NaMg(UO2)3(C2H3O2)9．9H2O(s) (yellow-green) ppt + 1~3d 6 M HCl + 1d S.Osolution + NaOH 鹼化 K2NaCo(NO2)6(s) (yellow) Na+ + Mg2+ + 3UO22+ + 9Co(NO2)6 +9H2O →NaMg(UO2)3(C2H3O2)9．9H2O(s) 2K+ + Na+ + Co(NO2)6→ K2NaCo(NO2)6(s) Mg(OH)2(s) (blue) 1. Mg2+ + NH4+ + PO4- + 6H2O → MgNH4PO4．6H2O (s) 2. MgNH4PO4．6H2O ↓ + 2H+→Mg2+ + NH4+ +H2PO4- + 6H2O 3. Mg2+ + 2OH-→ Mg(OH)2(s)

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