Five grams of an organic solid is dissolved in 100 ml of H20 (solvent 1). Which of the following extraction methods will remove the largest amount of the organic solid from the aqueous solution? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Three 50 ml portion extractions with ether (solvent 2) b Two 50 ml portion extractions with ether (solvent 2) с One 150 ml portion extractions with ether (solvent 2) d One 50 ml portion extractions with ether (solvent 2) o Q.7.2-Post-Lab Caffeine Extraction Homework. Unanswered The pka of 2,5-dinitrophenol is 5.15. Will it dissolve in sodium carbonate solution? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a No, typically organic phenols do not dissolve i aqueous solution b No, because the 2,5-dinitrophenolis basic с Yes, the 2,5-dinitrophenol will react with sodium carbonate, and the resulting salt will dissolve in aqueous solution d Yes, any phenol is soluble in sodium carbonatelution

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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..