Xác định :
X1 : Ba(HCO3)2
X2 : Ca(OH)2
X3 : Ca
X4 : H2O
X5 : FeCl2
X6 : Na2CO3
PTHH :
\(a.Ba\left(HCO3\right)2+Ca\left(OH\right)2->BaCO3+CaCO3+H2O\)
\(b.Ca+2H2O->Ca\left(OH\right)2+H2\uparrow\)
\(c.FeCl2+Na2CO3+H2O->Fe\left(OH\right)2\downarrow+CO2\uparrow+2NaCl\)