
EXPERT ANSWER
Organic extraction
Ans: a) Three 50mL extraction with ether (solvent 2).
The multiple extraction is effective than the bulk single extraction. Hence Three 50mL would be best.
2,5-Dinitro phenol:
Ans: C
The 2,5-Dinitrophenol pKa = 5.5, Hence it will react with Sodium bicarbonate (pKa of HCOO– = 6.4, higher than pKa of 2,5-Dinitro phenol) and resulted salt will dissolve in aqueous solution..