- C. KHCO3,Ba(OH)2KHCO _{3}, Ba ( OH )_{2}
- B ⋅KOH,Ba(HCO3)2\cdot KOH , Ba \left( HCO _{3}\right)_{2}
- D. NaHCO3,Ba(OH)2NaHCO _{3}, Ba ( OH )_{2}
- A. NaOH,NaOH , Ba (HCO3)2\left( HCO _{3}\right)_{2}