Предмет: Химия, автор: 15kent1971

реакция образования осадка при попадании мыла в твердую воду,если жесткость постоянна

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Автор ответа: тайная

0

в жесткой воде мыло образует осадок от того, что растворимая соль мыла переходит в нерастворимое состояние в виде хлопьев. Так как постоянна жесткость обусловлена появлением хлоридов. сульфатов кальция или магния, то уравнение будут следующими:

2С17H35COONa + CaCl2 = (C17H35COO)2Ca ↓ + 2NaCl

2С17H35COONa + CaSO4 = (C17H35COO)2Ca ↓ + Na2SO4

2С17H35COONa + MgCl2 = (C17H35COO)2Mg ↓ + 2NaCl

2С17H35COONa + MgSO4 = (C17H35COO)2Mg ↓ + Na2SO4

временная жесткость характеризуется присутсвием гидрокарбонатов кальция и магния, что тоже может вызвать выпадение осадка:

2С17H35COONa + Сa(HCO3)2 = (C17H35COO)2Ca ↓ + 2NaHCO3

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