Question

Цинк сожгли в кислороде. образовавшееся вещество растворили в серной кислоте. К полученному раствору прилили раствор гидроксида калия. Выпавший при этом осадок прокалили. Напишите уровнение 4-х реакций и назовите их продукты.

Answer 1

2Zn+O₂--->2ZnO(оксид цинка)
ZnO+H₂SO₄---->H₂O(вода)+ZnSO₄(cульфат цинка)
ZnSO₄+2KOH--->K₂SO₄(сульфат калия)+Zn(OH)₂↓(гидроксид цинка)
Zn(OH)₂↓--[t]-->ZnO(оксид цинка)+H₂O(вода)

Answer 2

Reaction 1: Burning Zinc in Oxygen

When zinc is burned in oxygen, it forms zinc oxide (ZnO) as a product.

The balanced chemical equation for this reaction is: ``` 2 Zn + O2 -> 2 ZnO ```

Reaction 2: Dissolving Zinc Oxide in Sulfuric Acid

The zinc oxide formed in the previous reaction is then dissolved in sulfuric acid (H2SO4). This reaction produces zinc sulfate (ZnSO4) and water (H2O) as products.

The balanced chemical equation for this reaction is: ``` ZnO + H2SO4 -> ZnSO4 + H2O ```

Reaction 3: Adding Potassium Hydroxide to the Zinc Sulfate Solution

To the resulting zinc sulfate solution, potassium hydroxide (KOH) is added. This reaction forms zinc hydroxide (Zn(OH)2) as a precipitate and potassium sulfate (K2SO4) as a soluble salt.

The balanced chemical equation for this reaction is: ``` ZnSO4 + 2 KOH -> Zn(OH)2 + K2SO4 ```

Reaction 4: Heating the Zinc Hydroxide Precipitate

The precipitated zinc hydroxide is then heated, resulting in the decomposition of zinc hydroxide into zinc oxide and water vapor.

The balanced chemical equation for this reaction is: ``` Zn(OH)2 -> ZnO + H2O ```

Summary of Reactions and Products:

1. Burning zinc in oxygen: - Reaction: 2 Zn + O2 -> 2 ZnO - Product: Zinc oxide (ZnO)

2. Dissolving zinc oxide in sulfuric acid: - Reaction: ZnO + H2SO4 -> ZnSO4 + H2O - Products: Zinc sulfate (ZnSO4) and water (H2O)

3. Adding potassium hydroxide to the zinc sulfate solution: - Reaction: ZnSO4 + 2 KOH -> Zn(OH)2 + K2SO4 - Products: Zinc hydroxide (Zn(OH)2) and potassium sulfate (K2SO4)

4. Heating the zinc hydroxide precipitate: - Reaction: Zn(OH)2 -> ZnO + H2O - Products: Zinc oxide (ZnO) and water (H2O)

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