The molar absorptivities of lithium picrate and of sodium picrate have been measured as a function of salt concentration (in the 0.1–1 mmol-dm−3 concentration range) in 2-propanol at 25°C. Values of the molar absorptivities of the free picrate ion ∈i, of the ion pair ∈p, and of the ion pair association constant Ka have been calculated for each salt. The Ka values for these two salts in this solvent calculated from spectrophotometric measurements were found to be the same within experimental uncertainty as the values of Ka calculated from conductance measurements.
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Kendrick, K.L., Gilkerson, W.R. Ion association of lithium and sodium picrate in 2-propanol at 25°C. II. Spectrophotometric measurements. J Solution Chem 15, 253–258 (1986). https://doi.org/10.1007/BF00646693
- ion association
- ion pair formation constant
- lithium picrate
- sodium picrate