1: H2SO4, NaNO2, H2O / 0.25 h / 0 - 5 °C 2: Cu2O, H2SO4, H2O / 20 h / 25 °C / pH 1.3 View Scheme

copper(I) oxide; sodium hydroxide; sulfuric acid; water; sodium hydrogencarbonate; sodium nitrite 1.) H2O, 0-5 deg C, 15 min, 2.) 25 deg C, 20 h; Yield given. Multistep reaction. Yields of byproduct given;