Question

mg(oh)₂ + hcl → mgcl₂ + h₂o
al(oh)₃ + h₂so₄ → al₂(so₄)₃ + h₂o

Explanation:

Step1: Balance the first equation ($\ce{Mg(OH)2 + HCl -> MgCl2 + H2O}$)

• Count atoms: Mg:1, O:2, H:3, Cl:1 on left; Mg:1, O:1, H:2, Cl:2 on right.
• Adjust HCl and $\ce{H2O}$: Put 2 in front of HCl and $\ce{H2O}$.
• Balanced equation: $\ce{Mg(OH)2 + 2HCl -> MgCl2 + 2H2O}$

Step2: Balance the second equation ($\ce{Al(OH)3 + H2SO4 -> Al2(SO4)3 + H2O}$)

• Count atoms: Al:1, O:7, H:5, S:1 on left; Al:2, O:13, H:2, S:3 on right.
• Adjust $\ce{Al(OH)3}$ (2), $\ce{H2SO4}$ (3), and $\ce{H2O}$ (6).
• Balanced equation: $\ce{2Al(OH)3 + 3H2SO4 -> Al2(SO4)3 + 6H2O}$

Answer:

Balanced equations:

1. $\boldsymbol{\ce{Mg(OH)2 + 2HCl -> MgCl2 + 2H2O}}$
2. $\boldsymbol{\ce{2Al(OH)3 + 3H2SO4 -> Al2(SO4)3 + 6H2O}}$