When aluminum metal is added to a concentrated solution of sodium hydroxide, it dissolves with the evolution of hydrogen gas. What is the final complex ion formed?
Q1. When aluminum metal is added to a concentrated solution of sodium hydroxide, it dissolves with the evolution of hydrogen gas. What is the final complex ion formed?
Answer: Sodium tetrahydroxoaluminate
Explanation: Aluminum is amphoteric and reacts with NaOH to form soluble sodium tetrahydroxoaluminate; Al(OH)3 is an intermediate that dissolves in excess base.