氢氧化钾法与硫酸法制备硫酸铝钾的区别探讨

doi:10.3866/PKU.DXHX201612006

Abstract

Abstract:

The differences between the synthesis of aluminum potassium sulfate by aluminum foil dissolved in KOH and in H₂SO₄ were studied. Analysis of the material balance during the entire synthesis process by back titration of aluminum ion told us that the yield of aluminum potassium sulfate was very low due to Al (OH)₃ precipitation produced by side reactions during the dissolution of aluminum foil in KOH. Stiring and lowering the KOH concentration could help to promote the yield with the H₂SO₄ method still showing a higher yield. Besides, the H₂SO₄ method was easier and more convenient. In summary, the H₂SO₄ method was recommended for students to carry out the synthesis of aluminum potassium sulfate.

Key words: Potassium hydroxide, Sulphuric acid, Aluminum potassium sulfate dodecahydrate

MSC2000:

Min PENG,Jian-Xin SHI,Zhou WANG,Rong LAI,Lian-Yun LI,Sai-Li ZHENG,Liu-Ping CHEN. The Differences between the Synthesis of Aluminum Potassium Sulfate by Aluminum Foil Dissolved in KOH and in H₂SO₄[J].University Chemistry, 2017, 32(5): 49-54.

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The Differences between the Synthesis of Aluminum Potassium Sulfate by Aluminum Foil Dissolved in KOH and in H₂SO₄

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The Differences between the Synthesis of Aluminum Potassium Sulfate by Aluminum Foil Dissolved in KOH and in H₂SO₄