Why does zinc increase in mass after being placed in NaOH?

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Answer 1 · 2017-06-28T03:53:07

Because of formation of the zincate species, #[Zn(OH)_4]^(2-)#...

Zinc metal is quite active, and can be oxidized under either acidic or basic conditions......

#"Oxidation.....:"#

#Zn(s) rarr Zn^(2+) + 2e^(-)#

#"Reduction.....:"#

#H_2O + e^(-)rarr 1/2H_2uarr+HO^-#

#"Overall....."#

#Zn(s) + 2H_2O(l) +2HO^(-) rarr H_2(g) + [Zn(OH)_4]^(2-)#