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Консультация № 181647
27.12.2010, 17:15
50.00 руб.
0
1
1
Здравствуйте, уважаемые эксперты! Прошу Вас ответить на следующий вопрос:
Вода содержит 0,12 г MgSO4 и 0,243 г Ca(HCO3)2 на 1 литр. Определить общую жесткость воды. Привести реакции фосфатного метода умягчения воды, содержащей данные соли.
Вода содержит 0,12 г MgSO4 и 0,243 г Ca(HCO3)2 на 1 литр. Определить общую жесткость воды. Привести реакции фосфатного метода умягчения воды, содержащей данные соли.
Обсуждение
27.12.2010, 19:51
общий
это ответ
Здравствуйте, Botsman!
Концентрация ионов магния
C(Mg2+)=C(MgSO4)=m(MgSO4)/(V[$183$]M(MgSO4))=0.12г/л/120г/моль=0,001 моль/л=1 ммоль/л
C(Ca2+)=C(Ca(HCO3)2)=m(Ca(HCO3)2)/(V[$183$]M(Ca(HCO3)2))=0.243г/л/162г/моль=0,0015 моль/л=1,5 ммоль/л
Итого жёсткость C(Mg2+)+C(Ca2+)=2.5 ммоль/л
Также часто жёсткость выражают как концентрацию эквивалентов. Учитывая, что ионы двухзарядные получаем жёсткость 5 ммоль экв./л
Суть фосфатного метода - осаждение данных ионов в виде нерастворимых фосфатов:
3MgSO4 + 2Na3PO4 [$8658$] Mg3(PO4)2[$8595$] + 3Na2SO4
3Mg2+ + 2PO43- [$8594$] Mg3(PO4)2[$8595$]
3Ca(HCO3)2 + 2Na3PO4 [$8658$] Ca3(PO4)2[$8595$] + 6NaHCO3
3Ca2+ + 2PO43- [$8594$] Ca3(PO4)2[$8595$]
Концентрация ионов магния
C(Mg2+)=C(MgSO4)=m(MgSO4)/(V[$183$]M(MgSO4))=0.12г/л/120г/моль=0,001 моль/л=1 ммоль/л
C(Ca2+)=C(Ca(HCO3)2)=m(Ca(HCO3)2)/(V[$183$]M(Ca(HCO3)2))=0.243г/л/162г/моль=0,0015 моль/л=1,5 ммоль/л
Итого жёсткость C(Mg2+)+C(Ca2+)=2.5 ммоль/л
Также часто жёсткость выражают как концентрацию эквивалентов. Учитывая, что ионы двухзарядные получаем жёсткость 5 ммоль экв./л
Суть фосфатного метода - осаждение данных ионов в виде нерастворимых фосфатов:
3MgSO4 + 2Na3PO4 [$8658$] Mg3(PO4)2[$8595$] + 3Na2SO4
3Mg2+ + 2PO43- [$8594$] Mg3(PO4)2[$8595$]
3Ca(HCO3)2 + 2Na3PO4 [$8658$] Ca3(PO4)2[$8595$] + 6NaHCO3
3Ca2+ + 2PO43- [$8594$] Ca3(PO4)2[$8595$]
5
Спасибо!
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