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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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The company is a production company specializing in the production of fine aluminum hydroxide. It employs many professors and professor-level senior engineers from well-known universities and research institutes as technical consultants.

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