Which of the following are the four most common aqueous phases used in extractions?
1) sat aq kbr
2) 0.5 m aq NH₄OH
3) 1 m aq NaOH
4) 1 m aq NaHCO₃
5) 0.5 m aq HNO₃
6) 2 m aq H₂SO₄
7) 1 m aq hcl
8) saturated aq NaCl