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Консультация № 198614
18.05.2020, 19:18
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Пробу сточной воды, содержащей ионы никеля, объемом 1,0 дм3 выпарили досуха. После отделения мешающих компонентов получили осадок диметилглиоксимата никеля. Промытый осадок растворили, добавили 10,0 см3 0,010 моль/дм3 раствора трилона Б, на титрование избытка которого затратили 3,05 см3 0,010 моль/дм3 стандартного раствора соли магния. Вычислите массовую концентрацию ионов никеля (мг/дм3) в сточной воде.
Уже час не могу решить
Пробу сточной воды, содержащей ионы никеля, объемом 1,0 дм3 выпарили досуха. После отделения мешающих компонентов получили осадок диметилглиоксимата никеля. Промытый осадок растворили, добавили 10,0 см3 0,010 моль/дм3 раствора трилона Б, на титрование избытка которого затратили 3,05 см3 0,010 моль/дм3 стандартного раствора соли магния. Вычислите массовую концентрацию ионов никеля (мг/дм3) в сточной воде.
Уже час не могу решить
Обсуждение
18.05.2020, 21:47
общий
это ответ
Здравствуйте, Shegol!
К раствору, содержащему анализируемый никель, добавили nТБ=10,0мл[$183$]0,010моль/л=0,10 ммоль комплексона, избыток которого при оттитровывании прореагировал с nMg=3,05мл[$183$]0,010моль/л=0,0305 ммоль ионов магния.
Поскольку комплексон реагирует с большинством металлов в пропорции 1:1, количество никеля
nNi=nТБ-nMg=0,0695 ммоль[$8776$]0,070 ммоль
Если объём исходного раствора 1,0 л, то массовая концентрация никеля равна
m/V=n[$183$]M/V=0,070ммоль[$183$]59г/моль/1,0л=4,1 мг/л
К раствору, содержащему анализируемый никель, добавили nТБ=10,0мл[$183$]0,010моль/л=0,10 ммоль комплексона, избыток которого при оттитровывании прореагировал с nMg=3,05мл[$183$]0,010моль/л=0,0305 ммоль ионов магния.
Поскольку комплексон реагирует с большинством металлов в пропорции 1:1, количество никеля
nNi=nТБ-nMg=0,0695 ммоль[$8776$]0,070 ммоль
Если объём исходного раствора 1,0 л, то массовая концентрация никеля равна
m/V=n[$183$]M/V=0,070ммоль[$183$]59г/моль/1,0л=4,1 мг/л
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