C6H3O3 + 2 NaOH → C6H2O7Na2 + H2O

Explanation:

The reaction between pyrogallic acid (C6H3O3) and sodium hydroxide (NaOH) results in the formation of sodium pyrogallol (C6H2O7Na2) and water (H2O). Sodium pyrogallol is the disodium salt of pyrogallic acid. The reaction can be classified as a neutralization reaction, as the acidic protons of pyrogallic acid are neutralized by the hydroxide ions of sodium hydroxide.