None: H2SO4 ( 9.5 mL ) 
None: H2SO4 ( 9.5 mL ) 
None: HNO3 ( 13 mL ) 
None: NaOH ( 150 mL ) 
None: 1 N NaOH solution 
None: dichloromethane ( 4x100 mL ) 
None: Na2SO4 
