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Determination 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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 Publication date 2007
and research's language is العربية
 Created by Shamra Editor




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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%.


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Research summary
تتناول هذه الورقة البحثية دراسة متوسط درجة الأكسدة للمنغنيز في مركبي ScMnO3 و CaMnO3 باستخدام طريقة المعايرة اليودية. تم تحضير المركبات عن طريق تفاعلات الحالة الصلبة عند درجات حرارة عالية، وتم تحليلها باستخدام حيود الأشعة السينية. تعتمد طريقة تحديد درجة الأكسدة على إذابة العينات في محلول HCl المركز، حيث يتم تقليل Cl2 الناتج بواسطة محلول KI، ومن ثم يتم معايرة I2 الناتج باستخدام محلول ثيوسلفات الصوديوم القياسي. أظهرت النتائج أن صيغة ScMnO3 هي ScMnO3+0.12، وصيغة CaMnO3 هي CaMnO3-0.03، مع انحراف معياري نسبي لا يتجاوز 3.5%.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة في مجال الكيمياء التحليلية، حيث تقدم طريقة دقيقة لتحديد متوسط درجة الأكسدة للمنغنيز في المركبات المعقدة. ومع ذلك، يمكن تحسين الدراسة من خلال توفير تفاصيل أكثر حول الظروف التجريبية مثل درجة الحرارة والضغط، وكذلك مناقشة أوسع حول تأثير العوامل الخارجية على النتائج. كما يمكن توسيع نطاق الدراسة لتشمل مركبات أخرى لزيادة موثوقية النتائج.
Questions related to the research
  1. ما هي الطريقة المستخدمة لتحديد متوسط درجة الأكسدة للمنغنيز في المركبات المدروسة؟

    تم استخدام طريقة المعايرة اليودية لتحديد متوسط درجة الأكسدة للمنغنيز في مركبي ScMnO3 و CaMnO3.

  2. ما هي الصيغ النهائية للمركبات المدروسة بناءً على النتائج؟

    الصيغ النهائية هي ScMnO3+0.12 لمركب ScMnO3 و CaMnO3-0.03 لمركب CaMnO3.

  3. ما هو الانحراف المعياري النسبي في تحديد كمية المنغنيز في المركبات؟

    الانحراف المعياري النسبي لا يتجاوز 3.5%.

  4. ما هي أهمية هذه الدراسة في مجال الكيمياء التحليلية؟

    تقدم هذه الدراسة طريقة دقيقة لتحديد متوسط درجة الأكسدة للمنغنيز في المركبات المعقدة، مما يساعد في فهم الخصائص الكيميائية والفيزيائية لهذه المركبات.


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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