Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract Potentials for the cell without liquid juction $$H_2 ,Pt|B(OH)_3 (m_1 ),NaB(OH)_4 (m_2 ),MCl_2 (m_3 )|AgCl,Ag$$ with M=Ca2+ or Mg2+ are reported over a range of ionic strength at 5, 15, 25, 35, 45, and 55°C. Parameters of Pitzer's ion interaction treatment are determined for Ca(B(OH)4)2 and Mg(B(OH)4)2 by fitting to the cell results. Apparent association of alkaline earth borates to form the monovalent species CaB(OH) 4 + and MgB(OH) 4 + makes it necessary to use the extended β(2) form of the ion interaction treatment to represent the potentials reported here. Trace activity coefficients of calcium and magnesium borates are tabulated at various temperatures and ionic strengths. The association constants for ion pair formation implied by the values of β(2) for these salts are compared with ion pair formation constants available in the literature.
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