Question

$AlCl _{3}$ in water at $pH <\,7$ forms

• A. tetrahedral $Al ( OH )_{4}^{-}$ ions
• B. octahedral $Al ( OH )_{6}^{3-}$ ions
• C. square planar $Al ( OH )_{4}^{-}$ ions
• D. Octahedral $Al \left( OH _{2}\right)_{6}^{3+}$ ions

Answer 1

Answer: (D)

$AlCl _{3}$ form $\left[ Al \left( H _{2} O \right)_{6}\right]^{3+}$ in water due to acidic medium $( pH <\,7)$.

$AlCl _{3}+6 H _{2} O \longrightarrow \left[ Al \left( H _{2} O \right)_{6}\right]^{3+}+3 Cl ^{\ominus}$