Abstract
The aim of the work was to find a suitable method and conditions for determining Na 2O wt.% from NaAlO 2. Problems were encountered while titrating NaAlO 2 with hydrochloric acid. The problematic area was the pH range 4–10 where aluminum precipitates as hydroxides. The different species of the aluminate solution were determined using potentiometric and complexometric titrations. The equivalent point of the potentiometric titration was detected using Gran's plotting method. Precipitation of aluminum hydroxides did not interfere with titrations, because in potentiometric titrations the pH value was over 10 and in complexometric titrations the pH was 4. The results were accurate and determinations were easy to carry out. Sodium was also determined by DCP-AES.
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