TH 202 EBULLIOMETRIC DETERMINATION OF VAPOUR PRESSURE Sandip - PowerPoint PPT Presentation

TH 202 EBULLIOMETRIC DETERMINATION OF VAPOUR PRESSURE • Sandip Mandal(09302021) • Utsab Mukherjee(123020004)

OBJECTIVES • To determine the saturation temperature of a liquid at a given pressure. • To determine Antoine constants (A,B) • To determine latent heat of vaporization.

THEORY • Boiling point temperature is the temperature at which vapor pressure of the liquid becomes equal to the ambient pressure and liquid turns into vapor. • The dependence of vapor pressure of the liquid at a given temperature is given by Clausius-Clapeyron equation Where Δ H is enthalpy of vaporization

It can be modified to give Antoine equation lnP=A – B/(T+C) Where B=

Experimental set up

Observations Correction factor=19 mm Hg

Results Slope=-B=-3780 k^-1, intercept=A=17.385

B= R=8.314 J/mol.K , Δ Z v =1 ΔH=31.427 KJ/mol

Safety measurements • Don’t increase the rheostat voltage excessively. It may lead to very fast generation vapor causing poor condensation. Finally vapor can deposit as liquid in the manometer. • Don’t go below vacuum pressure of 300 mm Hg. It may lead to the abovementioned problem.

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