2) K2CO3+H2O=KHCO3+KOH
KHCO3+KOH=K2CO3+H2O
K2CO3+HCL=KCL+H2O+CO2
CH2=CH-CH3+Br2=ch3-ch-ch2-br
2Mn(OH)2 + O2 + 2H2O = 2Mn(OH)4