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2Al(3+) + 3SO4(2-) + 6Na(+) + 6OH(-) --> 2Al(OH)3 + 6Na(+) + 3SO4(2-)
2aL(3+) + 6OH(-) --> 2Al(OH)3
2.2Fe(NO3)3 + 3Ca(OH)2-----> 2Fe(OH)3 [osad] + 3Ca(NO3)2
2Fe(3+) + 6NOE(-) + 3Ca(2+) + 6OH(-) --> 2Fe(OH)3 + 3Ca(2+) + 6NO3(-)
2Fe(3+) + 6OH(-) --> 2Fe(OH)3