The mechanism of extraction of Mo (VI) from diluted HCl and HNO 3 solutions with di(2-ethylhexyl) phosphoric acid (D2EHPA) dissolved in n-hexane has been investigated. The mechanism of extraction from both acids at pH 1.0 -6.0 was found to be majorly by cation exchange of MoO 2 2+ . The extraction efficiency was maximal at pH 1.0 for both acids, E% = 84.8 and 80.0 for HCl and HNO 3 media respectively. From the method of slope analysis, the number of D2EHPA molecules associated with MoO 2 2+ was found to be two at pH = 1.0.