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Date: 26-1-2017
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Date: 15-3-2016
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Date: 19-2-2019
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Arrhenius Definitions
In the 1880s, Svante Arrhenius defined acids and bases as substances that ionize in solution to produce H+ and OH- ions, respectively. We still often think of acids and bases in these terms, but the definitions can be misleading. For example, an aqueous solution of ammonia, NH3, contains ammonium and hydroxide ions, NH4+ and OH-; the Arrhenius definition suggests that these came from the ionization of NH4OH, but there is no such compound.
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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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العتبة العبّاسيّة: البحوث الّتي نوقشت في أسبوع الإمامة استطاعت أن تثري المشهد الثّقافي
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