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Date: 29-6-2020
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Date: 6-2-2018
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Date: 5-6-2020
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Aqua species of Mg2+, Ca2+, Sr2+ and Ba2+
Using 17O-labelled water, it is possible to confirm the hydration number in [Mg(H2O)6]2+ by use of 17O NMR spectroscopy, but for the aqua ions of Ca2+, Sr2+ and Ba2+, exchange between coordinated water and solvent is too fast on the NMR timescale for such studies. An octahedral coordination sphere has been established for [Mg(H2O)6]2+ in a number of crystalline salts, and also for [Ca(H2O)6]2+. The [Mg(H2O)6]2+ ion dissociates to some extent in aqueous solution, but hydrated cations of the later metals are not appreciably ionized and solutions of their salts derived from strong acids are neutral.
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إدارة الغذاء والدواء الأميركية تقرّ عقارا جديدا للألزهايمر
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شراء وقود الطائرات المستدام.. "الدفع" من جيب المسافر
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بالصور: غسل قبة مرقد الامام الحسين (ع) استعدادا لرفع راية الحزن السوداء قبيل حلول شهر محرم
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