Question

НCl→ ZnCl2 → Zn(OH)2 → ZnO → Zn

Answer 1

Ответ:

Zn+2HCl=ZnCl2 +H2;ZnCl2+2NaOH=Zn(OH)2+2NaCl;Zn(OH)2=(при температуре)ZnO+H2O;ZnO+H2=Zn+H2O или ZnO+CO=Zn+CO2

Answer 2

The sequence of chemical reactions you've provided seems to describe the conversion of hydrogen chloride (HCl) to elemental zinc (Zn). Let's break down each step:

1. HCl → ZnCl2: This is a redox reaction where hydrogen chloride (HCl) reacts with zinc (Zn) to form zinc chloride (ZnCl2). The balanced chemical equation for this reaction is:

   2 HCl + Zn → ZnCl2 + H2

2. ZnCl2 → Zn(OH)2: This step involves the conversion of zinc chloride (ZnCl2) to zinc hydroxide (Zn(OH)2) through a precipitation reaction. When you add a hydroxide source, like sodium hydroxide (NaOH), to an aqueous solution of zinc chloride, zinc hydroxide will precipitate:

   ZnCl2 + 2 NaOH → Zn(OH)2 + 2 NaCl

3. Zn(OH)2 → ZnO: This step involves the dehydration of zinc hydroxide (Zn(OH)2) to form zinc oxide (ZnO). This can be achieved by heating the zinc hydroxide:

   Zn(OH)2 → ZnO + H2O

4. ZnO → Zn: The final step is the reduction of zinc oxide (ZnO) to elemental zinc (Zn). This can be done by heating zinc oxide with carbon (usually in the form of powdered coal or coke) in a process called the reduction of metal oxides:

   ZnO + C → Zn + CO

In this sequence of reactions, you start with hydrogen chloride (HCl) and end up with elemental zinc (Zn) through a series of chemical transformations. These reactions are useful in various industrial processes and laboratory experiments involving the preparation of zinc or the recovery of zinc from compounds containing it.