Boiling point diagram for water-formic acid P-101.325 kPa 382 381 L-V 379 370 37
ID: 635250 • Letter: B
Question
Boiling point diagram for water-formic acid P-101.325 kPa 382 381 L-V 379 370 377 376 375 374 373 372 371 L-V 0 0.1 02 0.3 04 05 06 07 08 09 1 Mole Fraction Formic Acid a) Are water and formic acid miscible? b) Do water and formic acid form an ideal solution? o c) Based on this diagram, which would you expect to be greater, water-water intermolecular forces or water-fomic acid intermolecular forces? d) What is the composition of the azeotrope? e What is the vapor pressure of the azeotrope? Which component has the higher vapor pressure at 25 C and 1 atm? The following three questions apply to a water-formic acid solution with Xoric acd-0.7 g At what temperature would this solution begin to boil under the conditions shown by this diagram? h) If a fractional distillation of this solution were carried out, the composition of the liquid in the pot will tend toward what final value (of each component)? )If a fractional distillation of this solution were carried out, the composition of the distillate will tend toward what final value (of each component)? page 5Explanation / Answer
a) yes they (formic acid and water) are miscible below 373 K
b) yes they will make ideal solution ( they will folow Raults law)
c) water -formic acid intermolecular forces will be graeter because mixure boil at higher temperature
d) Azeotrop is when vapor molefraction is equal to liquid molefraction (YA = XA) or where Liquid and vapor meet YA = XA = 0.6 ( from graph)
e) Vapor pressure of azeotrop = PA = YA *P = 0.6 *101.325 Kpa = 60.795 Kpa
f)Water has higher vapor pressure than formic acid because boiling point of water is less (373K) in comparison to formic acid (373.8K)
g)When Xformic acid = 0.7 then boiling point = 379 K ( from graph liquid convert into vapor)
h) composition of liquid in pot tend Xformic acid = 0.7, Xwater= 0.3
i) Yformic acid = Kformic acid Xformic acid = > 0.7 and Ywater< 0.3
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