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Is aluminum hydroxide precipitated?
- Categories:News
- Time of issue:1558484520000
Is aluminum hydroxide precipitated?
- Categories:News
- Time of issue:2019-05-22 08:22
1. Process: common aluminum salt + ammonia
Al2(SO4)3+6NH3·H2O=2Al(OH)3↓+3(NH4)2SO4
Al3++3NH3·H2O=Al(OH)3↓+3NH4+
2. Nature
Al(OH)3 is a white gum that is almost insoluble in water and can condense suspended solids in water. Adsorption of pigments can purify water. Why not use a strong alkali solution such as NaOH when using Al(OH)3?
Al(OH)3 is soluble in both acid and alkali, forming salt and water.
Al(OH)3+3HCl=Al(OH)3+3H2O
Al(OH)3+3H+=Al3++3H2O
Al(OH)3+NaOH=NaAlO2+2H2O
Al(OH)3+OH-=AlO2-+2H2O
Experiment 1: Add NaOH solution to AlCl3 solution to excess
Al(OH)3+OH-=AlO2-+2H2O
AL(OH)3+NaOH=NaAlO2+2H2O
↓
Al3++3OH-=Al(OH)3↓
Al(OH)3+OH-=AlO2-+2H2O
Phenomenon: first produce a white precipitate, then the precipitate gradually dissolves
Experiment 2: Add AlCl3 solution to the NaOH solution to the excess
AlCl3+4NaOH=NaAlO2+3NaCl+2H2O
3NaAlO2+AlCl3+6H2O=4Al(OH)3↓+3NaCl
↓
Al3++4OH-=AlO2-+2H2O
Al3++3AlO2-+6H2O=4Al(OH)3↓
Phenomenon: no precipitation at first, white precipitate after a while and insoluble
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