REAKSIYaHOI MUBODILA, reaksiyahoi khimiyavii bayni du moddai murakkabro guyand, ki dar natija qismhoi tarkibii in moddaho ivaz meshavand:
VaS12 + 2№ON = Va(ON)2 + 2IaS!. Dar reaksiyai mazkur namaki khloridi bariy atomhoi khlorro ba guruhi gidroksil va ishqori natriy guruhi gidroksilro ba atomhoi khlor ivaz mekunand.