Cho dung dịch Ba(HCO3)2 vào CuSO4, K2CO3, Ca(OH)2, H2SO4, HCl, Ca(NO3)2

Số chất thỏa mãn gồm : CuSO₄ ; K₂CO₃ ; Ca(OH)₂;

$Ba{\left( {HC{O_3}} \right)_2} + CuS{O_4} \to BaS{O_4} \downarrow + Cu{\left( {HC{O_3}} \right)_2}$

$Ba{\left( {HC{O_3}} \right)_2} + {K_2}S{O_4} \to BaS{O_4} \downarrow + 2KHC{O_3}$

$Ba{\left( {HC{O_3}} \right)_2} + Ca{\left( {OH} \right)_2} \to BaS{O_4} \downarrow + CaC{O_3} \downarrow + 2{H_2}O$

$Ba{\left( {HC{O_3}} \right)_2} + {H_2}S{O_4} \to B{\rm{aS}}{O_4} \downarrow + 2C{O_2} \uparrow + 2{H_2}O$