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Консультация № 109961
18.11.2007, 11:06
0.00 руб.
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2
2
Зравствуйте! Вот такая задача:
При добавлении NH<sub>4</sub>ОН к раствору BeCl<sub>2</sub> образующийся вначале осадок растворяется при действии избытка реактива с образованием комплексного соединения. Напишите уравнения реакций.
Буду благодарен за решение.
При добавлении NH<sub>4</sub>ОН к раствору BeCl<sub>2</sub> образующийся вначале осадок растворяется при действии избытка реактива с образованием комплексного соединения. Напишите уравнения реакций.
Буду благодарен за решение.
Обсуждение
Неизвестный
18.11.2007, 11:26
общий
это ответ
Здравствуйте, piit!
BeCl2+ 2NH4OH = Be(OH)2{осадок} + 2NH4Cl
Be(OH)2 + 2NH4OH = NH42[Be(OH)4] эта реакция показывает амфотерные свойства
гидроксида бериллия
BeCl2+ 2NH4OH = Be(OH)2{осадок} + 2NH4Cl
Be(OH)2 + 2NH4OH = NH42[Be(OH)4] эта реакция показывает амфотерные свойства
гидроксида бериллия
Неизвестный
18.11.2007, 16:43
общий
это ответ
Здравствуйте, piit!
Не думаю, что там будет именно такое комплексное соединение, потому что оно неминуемо должно полностью гидролизоваться(NH<sub>3</sub> - слабое основание, H<sub>2</sub>[Be(OH)<sub>4</sub>] - очень слабая кислота; такое соединение просто не выживет в водном растворе). Там должно образоваться соединение немного другое: [Be(NH<sub>3</sub>)<sub>4</sub>](OH)<sub>2</sub>. Это Вам любой более-менее грамотный химик-координационщик скажет.
Не думаю, что там будет именно такое комплексное соединение, потому что оно неминуемо должно полностью гидролизоваться(NH<sub>3</sub> - слабое основание, H<sub>2</sub>[Be(OH)<sub>4</sub>] - очень слабая кислота; такое соединение просто не выживет в водном растворе). Там должно образоваться соединение немного другое: [Be(NH<sub>3</sub>)<sub>4</sub>](OH)<sub>2</sub>. Это Вам любой более-менее грамотный химик-координационщик скажет.
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