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Уважаемые Эксперты!Помогите, пожалуйста с физико-химическим анализом!!!
1. Молярный коэффициент погашения комплекса бериллия с ацетилацетоном в хлороформе равен 31.500. Определить процентное содержание бериллия в сплаве, если его навеска была растворена в 500мл. Оптическая плотность раствора ( после соответствующей обработки) при толщине слоя кюветы 5см равна 0.695.
2. Вычислить силу тока в ячейке, содержащей 0,1 н раствор хлорида калия с электродами площадью 4 см2 и расстоянием между ними 0,5 см, если прилагаемое напряжение составляет 400 мВ, а удельная электропроводность 1,167 Ом-1∙см-1
3. При титровании 5 порций по 10 мл одного и того же раствора израсходованы следующие объемы кислоты (в мл) : 2,35; 2,66; 2,83; 2,65; 2,96. Определите (промахи) с помощью Q-теста
4. Для определения никеля в ферритах методом бумажной хроматографии по площади пятна на бумаге, пропитанной диметилглиоксимом с водой в качестве растворителя, были получены следующие площади пятен в зависимости от концентрации никеля: С, мг/0.2 мл 0.12 0.45 0.90 1.20 1.65 S, мм2 26 44 66.5 83 105 При анализе феррита навеску 500 мг растворили в кислоте и разбавили до 25.0 мл. Пипеткой на хроматографическую бумагу нанесли 0.20 мл раствора и после хроматографического разделения определили площадь пятна, которая оказалась равной 52.5 мм2. Определить содержание никеля в феррите (%).
Может всё-таки коэфициент поглощения? A=k*C*l C=0,695/(31,5*5)=0,00441 M количество бериллия n=C*V=0,00221 M m=n*M=0,0200 г Вот только процентное содержание без массы навески определить невозможно
4 По данным пятнам получаем калибровочную прямую (точки практически на одной линии) EXCEL выдаёт уравнение данной линии y = 51,651x + 20,273 Подставив в уравнение значение площади пятна исследуемого раствора, получаем содержание никеля в 0,20мл раствора образца 0,62 мг (можно также воспользоваться линейной интерполяцией, результат должен быть примерно таким же) в 25 мл раствора содержится 0,62*25/0,2=78 мг итого содержание никеля в феррите 78/500=15,6%
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