Al2(SO4)3 + 6NaOH = 3Na2SO4 + 2Al(OH)3 (↓).
2Al(3+) + 3SO4(2-) + 6Na(+) + 6OH(-) = 6Na(+) + 3SO4(2-) + 2Al(OH)3 (↓).
2Al(3+) + 6OH(-) = 2Al(OH)3 (↓).
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Al2(SO4)3 + 6NaOH = 3Na2SO4 + 2Al(OH)3 (↓).
2Al(3+) + 3SO4(2-) + 6Na(+) + 6OH(-) = 6Na(+) + 3SO4(2-) + 2Al(OH)3 (↓).
2Al(3+) + 6OH(-) = 2Al(OH)3 (↓).
Удачи)