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[Al(H 2 O) 6 ] 3+ +H 2 O [Al(H 2 O) 5 OH] 2+ + H 3 O 3+<br />
Hydroxo cation<br />
pH สูง<br />
Al(OH) 3 (s) Gel<br />
hexaaquaaluminium ion<br />
Coordinate covalent