Answer to Question #312154 in Inorganic Chemistry for saaa

Question

how to make double alkali and what is a double alkali

Answer 1

The double alkali is aluminate, exapmple.

Molecular formula of aluminate is X_y(Al(OH)_z) or X(OH)*Al(OH)₃;

These compounds are formed by the action of alkali on freshly precipitated aluminum hydroxide.

Al(OH)₃ + NaOH = Na[Al(OH)₄]

Aluminates are also obtained by dissolving metallic aluminum (or Al₂O₃) in alkalis.

2Al + 2NaOH + 6H₂O = 2Na[Al(OH)₄] + 3H₂