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Консультация № 172287
17.09.2009, 23:02
0.00 руб.
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Дорогие эксперты прошу помочь,на носу экзамен а я ещё не сделала полностью контрольную по аналитической химии.Заранее очень благодарна вам за оказанную Вами помощь.
1. Вычислить рН раствора, содержащего 0,5 моль/л NH4Cl и 0,5 моль/л NH4OH (аммонийная буферная смесь), если константа диссоциации NH4OH равна 1,7910-5 . Объясните действие буферной смеси по регулированию концентрации H+ и OH- в водном растворе при добавлении кислот и щелочей.
2. Чему равна ионная сила 0,03 М раствора хлорида бария? Найдите коэффициенты активности и активность ионов в этом растворе.
3. Для обнаружения ионов Ca2+ смешивают равные объемы 0,02 М растворов Na2SO4 и CaCl2 . Выпадает ли осадок CaSO4? ПРCaSO4 = 6,1105 (при 250С).
1. Вычислить рН раствора, содержащего 0,5 моль/л NH4Cl и 0,5 моль/л NH4OH (аммонийная буферная смесь), если константа диссоциации NH4OH равна 1,7910-5 . Объясните действие буферной смеси по регулированию концентрации H+ и OH- в водном растворе при добавлении кислот и щелочей.
2. Чему равна ионная сила 0,03 М раствора хлорида бария? Найдите коэффициенты активности и активность ионов в этом растворе.
3. Для обнаружения ионов Ca2+ смешивают равные объемы 0,02 М растворов Na2SO4 и CaCl2 . Выпадает ли осадок CaSO4? ПРCaSO4 = 6,1105 (при 250С).
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