POTENTIOMETRIC STUDY OF THE MERCURY STATE IN SEAWATER (EXPERIMENTAL-DATA)

The association degree of mercury (I) and (II) in standard natural and artificial water at 20-degrees-C was experimentally measured using th e platinum, chloride and mercury liquid electrodes (potentiometric stu dy). The total activity coefficient of Hg2(2+) (HgI) turned out to be 1,8.10(-12) that means the presence of strong complexes with chloride ion. Association constants were measured as pK(Hg2Cl)+ = -8,0 +/- 0,5 and pK(Hg2Cl)2(0) = -12,3 0,3. The total activity coefficient of Hg2(HgII) was found as 5,5.10(-15). This is in a good agreement with the corresponding value esimated by use of the ion association model.