Reaction with excess OH-

• With excess NaOH, the Cr hydroxide dissolves. Cr becomes [Cr(OH)6 ]3- (aq) green solution
• •This hydroxide is classed as amphoteric because it can react with alkali to give a solution and react with acid to form the aqueous salt.
• write the equation for Cr(H2O)3 (OH)3 (s)

  equation