How would you balance this chemical equation? #As_2O_3 + NaOH -> Na_3AsO + H_2O#?
It misses the subscript 3 for the Oxygen of the salt in the second member of the equation. In the first member Arsenic has Oxidation number = 3 and it can't change with reacting with NaOH. The correct reaction is the formation of a salt by reaction of NaOH with an acid oxide