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Citation: PENG Min, SHI Jian-Xin, WANG Zhou, LAI Rong, LI Lian-Yun, ZHENG Sai-Li, CHEN Liu-Ping. 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. doi: 10.3866/PKU.DXHX201612006 shu

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

School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China

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.
- Potassium hydroxide,
- Sulphuric acid,
- Aluminum potassium sulfate dodecahydrate
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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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通讯作者: 陈斌, bchen63@163.com

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