29.(10分)(1)(2分)⑤③①④②
(2)(1分)⑤
(3)(1分)碱式滴定管
(4)(4分)2Al3+ + 3CO32― +3H2O = 2Al(OH)3 ↓+ 3CO2↑
Al3+ +3AlO2― +6H2O = 4Al(OH)3 ↓