كبريتات الكروم الثنائي

كبريتات الكروم الثنائي
كبريتات الكروم الثنائي
كبريتات الكروم الثنائي
الاسم النظامي (IUPAC)

Chromium(2+) sulfate

أسماء أخرى

chromous sulfate, chromous sulphate

المعرفات
CAS 13825-86-0  تعديل قيمة خاصية (P231) في ويكي بيانات
بوب كيم 61686[1]  تعديل قيمة خاصية (P662) في ويكي بيانات
مواصفات الإدخال النصي المبسط للجزيئات
  • [O-]S(=O)(=O)[O-].[Cr+2][1]  تعديل قيمة خاصية (P233) في ويكي بيانات
الخواص
الصيغة الجزيئية CrSO4
الكتلة المولية 148.05 غ/مول
المظهر صلب أزرق (خماسي الهيدرات)
الذوبانية في الماء 21 غ/100 مل ماء (خماسي هيدرات)
في حال عدم ورود غير ذلك فإن البيانات الواردة أعلاه معطاة بالحالة القياسية (عند 25 °س و 100 كيلوباسكال)

كبريتات الكروم الثنائي هو مركب كيميائي لاعضوي صيغته CrSO4، ويوجد في الشروط القياسية على هيئة صلب أزرق. يوجد هذا المركب غالباً مرتبطاً مع خمس جزيئات من الماء في بنيته البلورية (خماسي هيدرات) CrSO4·5 H2O؛ ويكون الكروم في حالة الأكسدة +2.

التحضير

يحضّر المركب من معالجة فلز الكروم مع حمض الكبريتيك:[2]

كما يمكن أن يحضّر من تفاعل أملاح الكبريتات مع أسيتات الكروم الثنائي؛[3] أو من اختزال كبريتات الكروم الثلاثي باستخدام فلز الزنك.[4]

الخواص

يوجد المركب في الشروط القياسية على هيئة صلب بلوري أزرق، وهو سهل الانحلال في الماء. إلا أن المحاليل المائية من الكروم الثنائي تكون سهلة التعرض لفعل الأكسدة بأكسجين الهواء لتتحول إلى مركبات الكروم الثلاثي الموافقة.

يتبنى الكروم الثنائي خماسي الهيدرات بنية جزيئية ثمانية السطوح في البنية البلورية لهذا المركب، ويتناسق مع ست ذرات من الأكسجين من الكبريتات ومن جزيئات الماء المحيطة.

الاستخدامات

تستخدم محاليل الكروم الثنائي عموماً على هيئة مواد مختزلة في المختبرات الكيميائية أثناء تفاعلات الاصطناع العضوي.[4]

المراجع

  1. ^ ا ب ج د Chromous sulfate (بالإنجليزية), QID:Q278487
  2. ^ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 2. p. 1365.
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (بالإنجليزية) (2 ed.). Butterworth-Heinemann. ISBN:0-08-037941-9.
  4. ^ ا ب A. Zurqiyah and C. E. Castro "Reduction of Conjugated Alkenes With Chromium(II) Sulfate: Diethyl Succinate" Organic Syntheses, Vol. 49, p.98 (1969).دُوِي:10.15227/orgsyn.049.0098

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