Abstract
The solubility of potassium bicarbonate and potassium meta-vanadate in water in the temperature range 293–323 K is reported. The concentration of vanadium(V) was determined using a spectrophotometric method applying hydrogen peroxide. The potassium ion concentration was measured by weight in the form of potassium tetraphenyloborate (K[B(C 6H 5) 4]). The results were used to construct a part of the polythermal solubility surface for the KHCO 3+KVO 3+H 2O system. In addition, the solution density dependence versus the potassium meta-vanadate concentration expressed in water free mole fractions is presented. These data are essential for the evaluation of a new, non-waste production method of potassium carbonate.
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