Physical And Chemical Properties Of Aluminum Hydroxide

A white gelatinous substance, almost insoluble in water. The anti-acid effect is slow, long-lasting, and strong. It has astringent effect and protects the mucous membrane. It causes constipation, does not produce CO₂ (carbon dioxide), has no acid rebound, and has no alkalinity.

Aluminum hydroxide reacts with acid: Al(OH)₃+3HCl==AlCl₃+3H₂O (can be used to neutralize gastric acid)

Al(OH)₃+3H→Al+3H₂O

Aluminum hydroxide reacts with alkali: Al(OH)3+NaOH→Na[Al(OH)4]==NaAlO2+2H2O

The isomerization reaction of aluminum hydroxide in an alkaline environment: Al(OH)3→H3AlO3 (aluminate)

Al(OH)₃+OH→AlO₂+2H₂O

Thermal decomposition of aluminum hydroxide: 2Al(OH)₃====Al₂O₃+3H₂O