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Консультация № 196851
28.10.2019, 11:44
0.00 руб.
28.10.2019, 16:22
0
3
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Сколько граммов Na2SO4[$183$]10H2O надо добавить к 600см3 6 мас.% раствора Na2SO4 (плотность раствора 1,053 г/см3), чтобы получить 1,3 М раствор (плотность раствора 1,151 г/см3 )? Вычислите титр и моляльность полученного раствора.
Сколько граммов Na2SO4[$183$]10H2O надо добавить к 600см3 6 мас.% раствора Na2SO4 (плотность раствора 1,053 г/см3), чтобы получить 1,3 М раствор (плотность раствора 1,151 г/см3 )? Вычислите титр и моляльность полученного раствора.
Обсуждение
28.10.2019, 14:58
общий
Адресаты:
Пожалуйста, уточните формулировку вопроса. Здесь явно либо не хватает части условия (сколько вещества добавить к раствору, чтобы получить раствор большей концентрации), либо неправильна сама формулировка (сколько вещества нужно растворить в воде, чтобы получить указанный раствор).
28.10.2019, 15:11
общий
Сколько граммов Na2SO4•10H2O надо добавить к 600
см^3 6 мас.% раствора Na2SO4 (плотность раствора 1,053 г/см^3 ),чтобы получить 1,3 М раствор (плотность раствора 1,151 г/см^3 )?Вычислите титр и моляльность полученного раствора.
см^3 6 мас.% раствора Na2SO4 (плотность раствора 1,053 г/см^3 ),чтобы получить 1,3 М раствор (плотность раствора 1,151 г/см^3 )?Вычислите титр и моляльность полученного раствора.
28.10.2019, 17:24
общий
это ответ
Здравствуйте, Ирина!
Исходный раствор имеет массу
m1=V1[$961$]1=600мл[$183$]1,053г/мл=632 г
и массовую долю вещества
[$969$]1=6%
Массовая доля вещества в конечном растворе
[$969$]2=C2[$183$]M/[$961$]2=1,3моль/л[$183$]0,001мл/л[$183$]142г/моль/1,151г/мл=16%
массовая доля безводного вещества в кристаллогидрате [$969$]0=142/322=44,1%
составим уравнение баланса массы
m1[$969$]1+m0[$969$]0=(m1+m0)[$969$]2
и выразим оттуда массу кристаллогидрата
m0[$969$]0-m0[$969$]2=m1[$969$]2-m1[$969$]1
m0=m1([$969$]2-[$969$]1)/([$969$]0-[$969$]2)=m1[$183$](16%-6%)/(44,1%-16%)=226 г Na2SO4[$183$]10H2O
Титр раствора равен m2/V2=MC2=142г/моль[$183$]1,3моль/л=185 г/л=0,185 г/мл=185 мг/мл
моляльная концентрация n(Na2SO4)/m(H2O)=C2/([$961$]2[$183$](100%-[$969$]2))=1,3моль/л/(1,151кг/л[$183$]84%)=1,345 моль/кг
Исходный раствор имеет массу
m1=V1[$961$]1=600мл[$183$]1,053г/мл=632 г
и массовую долю вещества
[$969$]1=6%
Массовая доля вещества в конечном растворе
[$969$]2=C2[$183$]M/[$961$]2=1,3моль/л[$183$]0,001мл/л[$183$]142г/моль/1,151г/мл=16%
массовая доля безводного вещества в кристаллогидрате [$969$]0=142/322=44,1%
составим уравнение баланса массы
m1[$969$]1+m0[$969$]0=(m1+m0)[$969$]2
и выразим оттуда массу кристаллогидрата
m0[$969$]0-m0[$969$]2=m1[$969$]2-m1[$969$]1
m0=m1([$969$]2-[$969$]1)/([$969$]0-[$969$]2)=m1[$183$](16%-6%)/(44,1%-16%)=226 г Na2SO4[$183$]10H2O
Титр раствора равен m2/V2=MC2=142г/моль[$183$]1,3моль/л=185 г/л=0,185 г/мл=185 мг/мл
моляльная концентрация n(Na2SO4)/m(H2O)=C2/([$961$]2[$183$](100%-[$969$]2))=1,3моль/л/(1,151кг/л[$183$]84%)=1,345 моль/кг
5
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