實驗 9 溶解度法則 Q & A
1 | Q:
請問為什麼實驗結果發現
Bi(III) 常常不符合溶解度法則? |
A:
Bi(III)不符合溶解度法則的部份主要是與鹽酸產生白色沉澱, 此沉澱可能是BiOCl (Ksp = 1.8 x 10-31)
關於Bi的性質建議你查看 高立書局出版之"化學大辭典", 作者為林敬二等, 有關鉍的敘述. 或是 "Qualitative Analysis and Electrolytic Solutions" 作者: E. J. King 是一本很傳統精細的敘述性化學書籍.
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2 | Q: AgCl沈澱應為白色,但實驗觀察到沈澱呈現紫色? |
A:AgCl細小沈澱照光易分解產生銀原子,使得沈澱呈現紫色。 In common with other silver halides, finely divided silver chloride undergoes photodecomposition: 2AgCl(s) ® 2Ag(s) + Cl(g) The elemental silver produced in this reaction is responsible for the violet color that develops in the precipitate. 參考:Skoog, D. A.; West, D. M.; Holler, F. J. Fundamentals of Analytical Chemistry; 5th ed., Saunders College Publishing: Chicago, 1988, p. 759. |
3 | Q: |
A: |