Abstract
In a.c. polarography of zinc, the second wave, both in potassium salt and ammonium salt solutions, is presumed to be due to zinc hydroxide formed on the electrode surface in the presence of dissolved oxygen. But when alkali is added, the second wave in ammonium salt solution is found to be due to Zn(OH) 2·(NH 3) 2 at 0.01∼0.05 M NH 3 and the third wave appears at p h > 7.3 in 2 M NH 3. While d.c. polarography gives only one wave, a.c. polarography shows two or three waves.
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