Final answer:
The balanced equation for the reaction of Mg(OH)2 with HCl is Mg(OH)2 (s) + 2HCl(aq) → MgCl2 (aq) + 2H2O(l), where magnesium chloride is the salt formed. Additionally, several other equations are balanced as per the materials provided.
Step-by-step explanation:
The student appears to have misconstrued the materials and the exercise is unrelated to magnesium and sodium carbonate. However, I will address the provided exercises.
Exercise 12.2.2
The balanced chemical equation for the neutralization reaction between HCl and Mg(OH)2 is:
Mg(OH)2 (s) + 2HCl(aq) → MgCl2 (aq) + 2H2O(l).
The salt formed in this reaction ismagnesium chloride.
Balance the Given Equations
2Mg + O2 → 2MgO
Ca + 2H2O → Ca(OH)2 + H2
CuCO3 + H2SO4 → CuSO4 + H2O + CO2
CaCl2 + Na2CO3 → CaCO3 + 2NaCl
C12H22O11 + 12O2 → 11H2O + 12CO2
BaCl2 + H2SO4 → BaSO4 + 2HCl
All reactions listed are appropriately balanced with their respective stoichiometric coefficients.