Предмет: Химия, автор: Аноним

ПОМОГИТЕ ПОЖАЛУЙСТА!!!!
Определить состав и составить качественные реакции
1)AgF
2)ZnY
3)Na²Co³​

Ответы

Автор ответа: danchik66666
1

Ответ:

№1

Na3PO4

Реакция образования желтого фосфата серебра - качественная реакция на фосфат-ион.

Na3PO4 + 3AgNO3= Ag3PO4 +3 NaNO3

Одной из самых чувствительных реакций на ион Na+ является реакция с уранилацетатом UO2(CH3COO)2 . Реакции проводят на предметном стекле микроскопа.

Каплю исследуемого раствора поместить на предметное стекло и осторожно выпарить раствор над пламенем спиртовки. На образовавшийся сухой остаток нанести каплю уксуснокислого раствора уранилацетата. Через 2 – 3 минуты рассмотреть под микроскопом характерные бледно-жёлтые кристаллы двойной соли – натрий-уранилацетата.

№2

Na2CO3 + Ba(OH)2 --> 2NaOH + BaCO3

2Na+ + CO32- + Ba2+ + 2OH- --> 2Na+ + 2OH- + BaCO3

Ba2+ + CO32- --> BaCO3

№3

(NH4)2SO4

кач. р-ция на сульфат ион: (NH4)2SO4 + BaCl2 --> 2NH4Cl + BaSO4 сульфат бария - осадок белого цвета

2NH4+ + SO42- + Ba2+ + 2Cl- --> 2NH4+ + 2Cl- + BaSO4

Ba2+ + SO42- --> BaSO4

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