The nature of the zinc‐containing ion in strongly alkaline solutions was determined by measuring electro'de potentials of zinc in such solutions under equilibrium conditions. Galvanic cells were used in which junction potentials were practically eliminated. Results indicate that in the concentration range of approximately 1–7 M potassium hydroxide all the zinc is in the form of a zincate ion, Zn ( OH ) 4 − − . The standard free energy of formation of this ion is −206.2 kcal.
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T. P. Dirkse (1954) studied this question.