Question

MgCl2+...= Mg(OH)2

Mg(OH)2+...= MgSO4

Answer 1

MgCl2 + 2NaOH = Mg(OH)2 + 2NaCl

Mg(OH)2 + H2SO4 = MgSO4 + 2H2O

Answer 2

MgCl2 + 2KOH = Mg(OH)2 + 2KCl
Mg(OH)2 + H2SO4 = MgSO4 + 2H2O