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Register a new userDetermination of average oxidation state of Mn in ScMnO3 andCaMnO3by using iodometric titration
تحديد متوسط درجة الأكسدة للمنغنيز في ScMnO3 و CaMnO3 بالمعايرة اليودية
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رياض طلي( باحث )
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اصطُنع في هذا البحث المركبان ScMnO3 و CaMnO3 بهدف تعيين متوسط درجة الأكسدة للمنغنيز في كل منهما، و قد استُعملت طريقة المعايرة اليودية لتحديد كمية كل من Mn+4 و Mn+ 3 فـي كـل مـن المركبين، و منه حسب عدد ذرات الأوكسجين الداخل في كل صيغة، و قد أعطت الحسابات النهائية الـصيغ الدقيقة الآتية :ScMnO3 و CaMnO3 بانحراف قياسي نسبي لا يتجاوز % 5.3.
The compounds ScMnO3 and CaMnO3 were obtained by high- temperature solid state reactions considering a stoichiometric rate of CaCO3: Mn2O3 and Sc2O3:Mn2O3. The findings were characterized by X-ray powder diffraction. The determination method of average oxidation state of these compounds based on dissolving the samples in concentrated HCl solution. Cl2 obtained by dissolving the samples is reduced by KI solution. I2 was titrated with standard sodium thiosulfate solution. In the calculation it was taken a as a fraction of Mn3+ in the mixed oxides. The formula of Scandium manganite was formulated as ScMnO3+0.12, and for calcium manganite as CaMnO3-0.03. The relative standard deviation in the identification of Mn does not exceed 3,5%.
References used
Advanced in physics, 1999, vol. 48, No. 2, 67 – 293
Physical Review. (1999). B 59, 8748-8788
Lurie,U.U. (1989). Reference in analytical chemistry, Moscow
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