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Консультация № 138394
28.05.2008, 23:50
0.00 руб.
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Уважаемые эксперты! помогите пожалуйста ответить на вопрос по коррозии металлов: Почему цинк корродирует в кислоте, а золото нет? И помогите еще составить уравнения реакций, протекающих при коррозии цинка в кислой среде.
Спасибо.
Спасибо.
Обсуждение
29.05.2008, 09:23
общий
это ответ
Здравствуйте, Dasha Kotova!
Восстановительный потенциал водорода 0, цинка -0,763, золота +1,498
Таким образом, потенциал реакции коррозии цинка полдожительный (+0,763В), а золота отрицательный (-1,498В)
K(-) 2H<sup>+</sup>+2e<sup>-</sup>=H<sub>2</sub>
A(+) Mg-2e<sup>-</sup>=Mg<sup>2+</sup>
Mg+2H<sup>+</sup>=Mg<sup>2+</sup>+H<sub>2</sub>
Восстановительный потенциал водорода 0, цинка -0,763, золота +1,498
Таким образом, потенциал реакции коррозии цинка полдожительный (+0,763В), а золота отрицательный (-1,498В)
K(-) 2H<sup>+</sup>+2e<sup>-</sup>=H<sub>2</sub>
A(+) Mg-2e<sup>-</sup>=Mg<sup>2+</sup>
Mg+2H<sup>+</sup>=Mg<sup>2+</sup>+H<sub>2</sub>
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