Bài giảng Hóa vô cơ - Chương 10: Phân nhóm VIIb - Nguyễn Văn HòaMột dung dịch KMnO4 được chuẩn độ trong môi trường axit bằng 20ml dung dịch Na2C2O4 0,15N. Tính nồng độ đương lượng KMnO4. Dùng dung dịch KMnO4 ở trên xác định nồng độ của FeSO4. Cứ 10ml dung dịch FeSO4 cần dùng 14,6ml dung dịch KMnO4. Xác định nồng độ của FeSO4.
16 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 761 | Lượt tải: 0
Research on ion exchange capacity of oxidizedactivated carbon - Pham Thi Hai Thinh4. CONCLUSIONS In order to improve adsorption properties of AC for cations in water environment, modification of AC was inducted by HNO3. By batch experiment of oxidated AC (OAC), the removal efficiency of NH4+, Ca2+, Cr3+ by OAC oxidized at different HNO3 concentrations was studied. The oxidation of AC with nitric acid changed the chemical pro...
6 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 475 | Lượt tải: 0
Degradation of glyphosate herbicide by an anodic oxidation process - Thanh Son Le4. CONCLUSION This study has shown the possibility of using an electrochemical technique to efficiently oxidise glyphosate (4 -16 mg L-1) by the Ti/PbO2 anode. These works demonstrated that the current intensity, treatment time, pH and initial concentration are the influent parameters. The electrochemical reactor operated at current intensity o...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 459 | Lượt tải: 0
The S-Block elementsA soap acts by dispersing grease and oil films into microscopic droplets. The droplets detach themselves from the surfaces being cleaned, become suspended in water, and are removed by rinsing. The alkali metal soaps are water soluble; the alkaline earth metal soaps are not. A soap can function well in hard water only after a part of it is used u...
27 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 501 | Lượt tải: 0
Preparation and characterization of porous carbon from rice husk applied for electrode materials - Nguyen Thi Thu Huyen4. CONCLUSIONS Porous carbon was successfully synthesized by pyrolysis of RH at 450 oC during 3 hours under N2 gas atmosphere followed by hydrothermal treatment in NaOH 2M at 150 oC within 3 hours to remove the silica fraction. The activated porous carbon which obtained by K2CO3 activation at 900 oC has high specific surface area (SBET = 796.3 ...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 492 | Lượt tải: 0
Bài giảng Hóa học vô cơ - Chương 8 – Nguyên tố chuyển tiếp - Nguyễn Văn Hòa3. Cho biết độ tan của AgI (TAgI = 8,3.10-17) trong dung dịch NH3 1M. Biết Kb [Ag(NH3)2]+ = 108. 4. Xác định thế điện cực của Ag+/Ag khi cho NaCN vào dung dịch Ag(NO3)2 1M. Biết 0Ag+/Ag = 0,8V và [Ag(CN)2]- = 7,8.1019. (ĐS: - 0,37 V)
42 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 933 | Lượt tải: 0
Determination of atmospheric corrosion rate of metals in 12 Vietnamese areas - Pham Duy Nam4. CONCLUSIONS Most areas in the mainland of Vietnam has moderate or high corrosion rates for all four standard metals. In marine and coastal atmospheric regions, levels of corrosion are higher. It is particularly high on offshore islands. For instance, a CX corrosion level (extreme level) was found on Bach Long Vy island for steel samples. In...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 493 | Lượt tải: 0
Study on the properties of silver plating on A6061 aluminum alloy - Vu Minh Thanh4. CONCLUSION From the properties of the silver plating on the A6061 base, it can be showed that the plating was homogeneous, smooth and shiny structure, with a thickness of about 9.7 μm. The plating has a chemical composition and phase composition of silver metal with very high purity. Measurement results of corrosion current, frost accelerati...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 461 | Lượt tải: 0
Recoveringrare earth oxide from NdFeB magnet of waste hdds by leaching and selective precipitation methods - Pham Khanh Huy4. CONCLUSION The recovery of Neodymium from NdFeB magnet which contains 26 % of total rare earth and 60 % of Fe by crystallization and precipitation method has worked. Magnetic flux density of the NdFeB magnet was eliminated completely at 300 ºC after one hour in electric furnace. By the using selective crystallize and precipitation method by ...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 477 | Lượt tải: 0
Influence of monoethylene glycol on corrosion inhibitor of wet gas pipeline - Nguyen Thi Le Hien4. CONCLUSIONS MEG is a weak acid and causes a decrease in the pH of the solutions with increasing amounts of MEG, while in CO2 saturated solutions the pH of the solution is determined by the partial pressure of CO2. An increase in the MEG concentration results in a decrease in the corrosion rate at all concentrations and conditions of testing...
11 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 466 | Lượt tải: 0
