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Консультация № 169637
20.06.2009, 09:56
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Помогите пожалуйста:
Составить молекулярные и ионно-молекулярные уравнения реакций между следующими веществами:
а)Сульфат натрия и хлорид калия
б)фосфорная кислота и гидроксид натрия
в)нитрат кальция и фосфат калия
Составить молекулярные и ионно-молекулярные уравнения реакций между следующими веществами:
а)Сульфат натрия и хлорид калия
б)фосфорная кислота и гидроксид натрия
в)нитрат кальция и фосфат калия
Обсуждение
Неизвестный
20.06.2009, 10:08
общий
это ответ
Здравствуйте, МаксимОК.
а) Сульфат натрия с хлоридом калия реагировать не будет. Это все суть сильные электролиты, которые, хорошо растворяясь в воде, диссоциируют на ионы практически нацело. Если поменять местами анионы в этих электролитах - то есть, рассмотреть пару "сульфат калия + хлорид натрия", - нетрудно заметить, что эти два вещества обладают сходными свойствами, тогда как реакция между двумя веществами была бы возможна в том случае, если бы один из продуктов из системы выводился - выпадал в осадок, улетал в виде газа или не обладал бы свойствами сильного электролита. Ничего подобного в данном случае не наблюдается, поэтому реакции нет.
б) NaOH + H3PO4 = NaH2PO4 + H2O
2NaOH + H3PO4 = Na2HPO4 + 2H2O
3NaOH + H3PO4 = Na3PO4 + 3H2O
OH- + H3PO4 = H2PO4- + H2O
2OH- + H3PO4 = HPO42- + 2H2O
3OH- + H3PO4 = PO43- + 3H2O
в) 3Ca(NO3)2 + 2K3PO4 = 6KNO3 + Ca3(PO4)2[$8595$]
3Ca2+ + 2PO43- = Ca3(PO4)2[$8595$]
С уважением, Товарищ Бородин
а) Сульфат натрия с хлоридом калия реагировать не будет. Это все суть сильные электролиты, которые, хорошо растворяясь в воде, диссоциируют на ионы практически нацело. Если поменять местами анионы в этих электролитах - то есть, рассмотреть пару "сульфат калия + хлорид натрия", - нетрудно заметить, что эти два вещества обладают сходными свойствами, тогда как реакция между двумя веществами была бы возможна в том случае, если бы один из продуктов из системы выводился - выпадал в осадок, улетал в виде газа или не обладал бы свойствами сильного электролита. Ничего подобного в данном случае не наблюдается, поэтому реакции нет.
б) NaOH + H3PO4 = NaH2PO4 + H2O
2NaOH + H3PO4 = Na2HPO4 + 2H2O
3NaOH + H3PO4 = Na3PO4 + 3H2O
OH- + H3PO4 = H2PO4- + H2O
2OH- + H3PO4 = HPO42- + 2H2O
3OH- + H3PO4 = PO43- + 3H2O
в) 3Ca(NO3)2 + 2K3PO4 = 6KNO3 + Ca3(PO4)2[$8595$]
3Ca2+ + 2PO43- = Ca3(PO4)2[$8595$]
С уважением, Товарищ Бородин
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