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Консультация № 183615
14.06.2011, 13:12
60.56 руб.
0
1
1
Здравствуйте! Прошу помощи в следующем вопросе:
Рассчитайте массу гашеной извести Ca(OH)2 ,необходимую для устранения временной жесткости воды равной 7.2 мольэкв/м3 в 10 её литрах.
заранее благодарен!
Рассчитайте массу гашеной извести Ca(OH)2 ,необходимую для устранения временной жесткости воды равной 7.2 мольэкв/м3 в 10 её литрах.
заранее благодарен!
Обсуждение
Неизвестный
14.06.2011, 13:24
общий
это ответ
Здравствуйте, G-buck!
Ca(HCO3)2 + Ca(OH)2 = 2CaCO3 + 2H2O
Найдем количество вещества гидрокарбоната кальция
n(Ca(HCO3)2)=1/2[$149$]n(1/2Ca(HCO3)2)= 1/2 [$149$] V[$149$]C=
=1/2 [$149$] 0,01м3 [$149$] 7,2 моль/м3=0,036моль
n(Ca(OH)2)=n(Ca(HCO3)2)=0.036моль
m(Ca(OH)2)=n(Ca(OH)2)[$149$]M(Ca(OH)2)= 0.036моль[$149$]74г/моль = 2,664г
Ca(HCO3)2 + Ca(OH)2 = 2CaCO3 + 2H2O
Найдем количество вещества гидрокарбоната кальция
n(Ca(HCO3)2)=1/2[$149$]n(1/2Ca(HCO3)2)= 1/2 [$149$] V[$149$]C=
=1/2 [$149$] 0,01м3 [$149$] 7,2 моль/м3=0,036моль
n(Ca(OH)2)=n(Ca(HCO3)2)=0.036моль
m(Ca(OH)2)=n(Ca(OH)2)[$149$]M(Ca(OH)2)= 0.036моль[$149$]74г/моль = 2,664г
5
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