Question

Zn(OH)2–ZnO—Zn(NO3)2–Zn(OH)2–ZnCl2

Answer 1

Zn(OH)2  t→ZnO + H2O
2HNO3 + ZnO → Zn(NO3)2 + H2O
Zn(NO3)2 + 2KOH → Zn(OH)2 + 2KNO3
Zn(OH)2 + 2HCl → ZnCl2 + 2H2O

Answer 2

It seems like you've listed a sequence of chemical reactions involving zinc compounds. Let's break down what happens in each step:

1. Zn(OH)2:

   • Zinc hydroxide, Zn(OH)2, is a white solid that can be formed by the reaction of zinc ions (Zn²⁺) with hydroxide ions (OH⁻).

2. Zn(OH)2 → ZnO:

   • This appears to be a decomposition reaction. When zinc hydroxide (Zn(OH)2) is heated or subjected to appropriate conditions, it can decompose into zinc oxide (ZnO) and water (H2O).
   • The reaction can be represented as: Zn(OH)2 → ZnO + H2O

3. ZnO → Zn(NO3)2:

   • It's not clear how this transformation occurs. Typically, zinc oxide (ZnO) doesn't directly convert into zinc nitrate (Zn(NO3)2) without the presence of additional reactants and specific conditions.

4. Zn(NO3)2 → Zn(OH)2:

   • Zinc nitrate (Zn(NO3)2) can be transformed into zinc hydroxide (Zn(OH)2) by the addition of a base like sodium hydroxide (NaOH). This reaction results in the precipitation of zinc hydroxide from the solution.
   • The reaction can be represented as: Zn(NO3)2 + 2NaOH → Zn(OH)2 + 2NaNO3

5. Zn(OH)2 → ZnCl2:

   • This reaction would involve the conversion of zinc hydroxide (Zn(OH)2) into zinc chloride (ZnCl2), likely through a reaction with hydrochloric acid (HCl) or another chloride source. This reaction would produce water as a byproduct.
   • The reaction can be represented as: Zn(OH)2 + 2HCl → ZnCl2 + 2H2O

In summary, the sequence you've listed involves various reactions of zinc compounds, including the decomposition of zinc hydroxide to zinc oxide, the conversion of zinc nitrate to zinc hydroxide through a base, and the conversion of zinc hydroxide to zinc chloride through an acid. Each of these reactions has specific conditions and reactants required for the transformation to occur.