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Задать вопрос экспертам

Консультация № 161068

21.02.2009, 14:30

0.00 руб.

0 1 1

Образование

Уважаемые Эксперты розвяжите цепочку реакций.
а) Ca -> Ca(OH)2 -> CaCO3 -> CaO -> Ca(OH)2 -> CaCl2 -> CaSO4
б) Mg -> MgO -> MgCl2 -> MaCO3 -> Mg(HCO3)2 -> MgCO3 -> CO2 -> NaCO3

И задачу: Как розпознать барий карбонат, барий сульфит, барий сульфат? Если у вас есть в розпоряжении только HCl...

Обсуждение

Неизвестный

21.02.2009, 16:50

общий

это ответ

Здравствуйте, Guk007!
а) Ca + 2H₂O = Ca(OH)₂ + H₂
Ca(OH)₂ + CO₂ =(в водном растворе)= CaCO₃ + H₂O
CaCO₃ =(нагревание в печи до ~1000[$186$]C)= CaO + CO₂
CaO + H₂O = Ca(OH)₂
Ca(OH)₂ + 2HCl = CaCl₂ + 2H₂O
CaCl₂ + Na₂SO₄ = CaSO₄ + 2NaCl

б) 2Mg + O₂ =(нагревание)= 2MgO
MgO + 2HCl = MgCl₂ + H₂O
MgCl₂ + Na₂CO₃ = MgCO₃ + 2NaCl
MgCO₃ + CO₂ + H₂O = Mg(HCO₃)₂
Mg(HCO₃)₂ =(кипячение раствора)= MgCO₃ + H₂O + CO₂
MgCO₃ + 2HCl = MgCl₂ + CO₂ + H₂O
CO₂ + 2NaOH = Na₂CO₃ + H₂O

Задача.
Из приведенных трех веществ с соляной кислотой реагируют сульфит и карбонат. Сульфат бария, таким образом, остается в единственном числе. При реакции с соляной кислотой карбоната бария выделяется углекислый газ, практически не имеющий запаха, а при реакции сульфита - сернистый газ, запах которого прошибет любой насморк.

Уравнения реакций:

BaCO₃ + 2HCl = BaCl₂ + CO₂[$8593$] + H₂O
BaSO₃ + 2HCl = BaCl₂ + SO₂[$8593$] + H₂O

С уважением, Товарищ Бородин

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