Physical Principles II
Chemical Engineering Department
Name: Juphil Lamanilao Date: October 15, 2009
Course & Yr: BSChE-4
I.TITLE: Chemical Equilibrium in a Liquid Phase
• To determine the equilibrium constant.
50 ml burette, 8 test tubes with cork, 50 ml 6N HCl, 500 ml of std 1N NaOH, 15ml
pure CH3COOC2H5, 15ml CH3COOH, 15ml absolute C2H5OH
Chemical Equilibrium in a Liquid Phase 1
Physical Principles II
The experimental values gathered for the equilibrium constant approaches
roughly to 0.0164 for HCl and H2O. Furthermore, 0.0379 was obtained for HCl and
C2H5COOC2H5 mixture. For the HCl-CH3COOH- C2H5OH mixture, the equilibrium
constant approaches 0.0013. From the data obtained, results showed that the
concentration of NaOH decreases as the number of compounds in the mixture escalates.
Consequently, the equilibrium constant will differ in all the components in the reaction
mixture; it varies in both products and reactants. As observed, the equilibrium constant
Kc is the same no matter how much is the starting amount.
VIII.APPLICATION TO ChE:
By way of attaining chemical equilibrium, constituents and properties of intricate
mixtures can be obtained. Various applications include Liquid-liquid extraction, Ion
exchange, Chromatography & Solubility product and in constructing bomb detonators
which are commonly related to the field of chemical engineering.
In a chemical process, chemical equilibrium is the state in which the chemical
activities or concentrations of the reactants and products have no net change over time.
They proceed to a certain point and then apparently stop, often leaving considerable
amounts of unaffected reactants. Under any given set of conditions of temperature,
pressure, and concentration, the point at which any reaction seems to stop is always the
same; there exists at this point among the concentrations of the various reactants and
products of any reaction a reaction which is definitely fixed. When a reaction reaches
this stage in its course, it is said to be in equilibrium. In this experiment, Kc is expressed
by esterification reaction. Comparably with hydrolysis, esterification process is very
slow at room temperature. Whatever the proportions of acid and alcohol that are mixed
together, Kc always has the same value.
Chemical Equilibrium in a Liquid Phase 3