1.1
Reagents:
Sulfuric acid
Solvents:
Water
;
25 °C → 100 °C; 13 h, 100 °C; 100 °C → 25 °C
1.2
Reagents:
Water
;
cooled
1.3
Reagents:
Sodium hydroxide
Solvents:
Water
;
basified


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