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Консультация № 181668
29.12.2010, 14:07
0.00 руб.
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Здравствуйте, уважаемые эксперты! Прошу Вас ответить на следующий вопрос:
Какой объём 0,1 н HNO3 можно приготовить из 0,7 л раствора азотной кислоты с массовой долей 30% (p=1180кг\м^3) ?
Какой объём 0,5 н Al2(SO4)3 требуется для реакции с 0,03 л 0,15 М раствором Ca(NO3)2?
Какой объём 0,1 н HNO3 можно приготовить из 0,7 л раствора азотной кислоты с массовой долей 30% (p=1180кг\м^3) ?
Какой объём 0,5 н Al2(SO4)3 требуется для реакции с 0,03 л 0,15 М раствором Ca(NO3)2?
Обсуждение
03.01.2011, 00:47
общий
это ответ
Здравствуйте, urakird8909!
1) m30%раствора=V30%раствора[$183$][$961$]30%раствора=0,7л[$183$]1180г/л=826 г
m(HNO3)=m30%раствора[$183$][$969$]=826г[$183$]30%=248 г
n(HNO3)=m(HNO3)/M(HNO3)=248г/63г/моль=3,93 моль
Азотная кислота одноосновна, поэтому для неё молярность совпадает с нормальностью C=0.1 M
V0,1н раствора=n(HNO3)/С=3,93моль/0,1моль/л=39,3 л[$8776$]40 л
2) n(Ca(NO3)2)=V(Ca(NO3)2)[$183$]C(Ca(NO3)2)=0,03л[$183$]0,15моль/л=0,0045 моль
nэкв(Al2(SO4)3)=nэкв(Ca(NO3)2)=2n(Ca(NO3)2)=0.009 моль экв.
V(Al2(SO4)3)=nэкв(Al2(SO4)3)Cэкв(Al2(SO4)3)=0,009моль экв./0,5н=0,018 л
1) m30%раствора=V30%раствора[$183$][$961$]30%раствора=0,7л[$183$]1180г/л=826 г
m(HNO3)=m30%раствора[$183$][$969$]=826г[$183$]30%=248 г
n(HNO3)=m(HNO3)/M(HNO3)=248г/63г/моль=3,93 моль
Азотная кислота одноосновна, поэтому для неё молярность совпадает с нормальностью C=0.1 M
V0,1н раствора=n(HNO3)/С=3,93моль/0,1моль/л=39,3 л[$8776$]40 л
2) n(Ca(NO3)2)=V(Ca(NO3)2)[$183$]C(Ca(NO3)2)=0,03л[$183$]0,15моль/л=0,0045 моль
nэкв(Al2(SO4)3)=nэкв(Ca(NO3)2)=2n(Ca(NO3)2)=0.009 моль экв.
V(Al2(SO4)3)=nэкв(Al2(SO4)3)Cэкв(Al2(SO4)3)=0,009моль экв./0,5н=0,018 л
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