Please help me explain why these reactions occur and find a balanced net ionic e

Question

Please help me explain why these reactions occur and find a balanced net ionic equation.

1. When 6M NaOH is added dropwise to a solution of ZnCl2, a white precipitate forms which dissolves to form a colorless solution as excess reagent is added.

2. When 6M NH3 is added dropwise to a solution of Zn(NO3)2, a white precipitate forms which dissolves to form a colorless solution as excess reagent is added.

3. When 6M NaOH is added dropwise to a solution of AlCl3, a white precipitate forms which dissolves when 6M HCl is added.

Explanation / Answer

1)

2NaOh + ZnCl2 -> 2NaCl + Zn(OH)2

white precipitate is Zn(OH)2 but then gets in solution as excess reagent is added

Zn+2 + 2

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