1: fuming H2SO4 / 3 h / 90 °C 2: 1.) aq. KOH, 2.) aq. HCl / 1) pH 12.5, 50 deg C, 10 min; 2) pH 2.0, 50 deg C, 10 min; 3) pH 2, 3 d, room temperature 3: 79 percent / H2O / 48 h 4: 1.) aq. H2SO4, 2.) aq. KCl / 1) 4 deg C, 24 h; 2) 50 deg C 5: 97 percent / aq. NaOH / 0.25 h / Ambient temperature; pH 10 6: 8.95 g / Dowex 50W-X2 View Scheme

1: 79 percent / H2O / 48 h 2: 1.) aq. H2SO4, 2.) aq. KCl / 1) 4 deg C, 24 h; 2) 50 deg C 3: 97 percent / aq. NaOH / 0.25 h / Ambient temperature; pH 10 4: 8.95 g / Dowex 50W-X2 View Scheme

1: 79 percent / H2O / 48 h 2: 1.) aq. H2SO4, 2.) aq. KCl / 1) 4 deg C, 24 h; 2) 50 deg C 3: 97 percent / aq. NaOH / 0.25 h / Ambient temperature; pH 10 4: 8.95 g / Dowex 50W-X2 View Scheme

1: 1.) aq. KOH, 2.) aq. HCl / 1) pH 12.5, 50 deg C, 10 min; 2) pH 2.0, 50 deg C, 10 min; 3) pH 2, 3 d, room temperature 2: 79 percent / H2O / 48 h 3: 1.) aq. H2SO4, 2.) aq. KCl / 1) 4 deg C, 24 h; 2) 50 deg C 4: 97 percent / aq. NaOH / 0.25 h / Ambient temperature; pH 10 5: 8.95 g / Dowex 50W-X2 View Scheme

DOWEX 50W-X2

1: 1.) aq. H2SO4, 2.) aq. KCl / 1) 4 deg C, 24 h; 2) 50 deg C 2: 97 percent / aq. NaOH / 0.25 h / Ambient temperature; pH 10 3: 8.95 g / Dowex 50W-X2 View Scheme

1: 97 percent / aq. NaOH / 0.25 h / Ambient temperature; pH 10 2: 8.95 g / Dowex 50W-X2 View Scheme