Problem Page A chemical engineer is studying the following reaction: HCH3CO2 (aq

Question

Problem Page

A chemical engineer is studying the following reaction:

HCH3CO2

(aq)

+CH3NH2

(aq)

CH3CO2

(aq)

+CH3NH+3

(aq)

At the temperature the engineer picks, the equilibrium constant

Kc

for this reaction is

1.3

.

The engineer charges ("fills") four reaction vessels with acetic acid and methylamine, and lets the reaction begin. He then measures the composition of the mixture inside each vessel from time to time. His first set of measurements are shown in the table below.

Predict the changes in the compositions the engineer should expect next time he measures the compositions.

A chemical engineer is studying the following reaction: HCH3CO2 (aq) CH3NH2(aq) CH2CO, (aa)- CH2NH2 (aq) At the temperature the engineer picks, the equilibrium constant for this reaction is 1.3. The engineer charges ("fills") four reaction vessels with acetic acid and methylamine, and lets the reaction begin. He then measures the composition of the mixture inside each vessel from time to time. His first set of measurements are shown in the table below. Predict the changes in the compositions the engineer should expect next time he measures the compositions. compound concentratior expected change in concentration CH CO 0.63 M t increase decrease no change CHNH 0.99 M t increase o decrease o (no change) CH Co, 0.89 M t increase o decrease (no change) CH, NH 0.93 M t increase o decrease no change CH CO 1.00 M o t increase decrease no change CHNH 1.36 M t increase o decrease o (no change) CH Co, 0.52 M t increase o decrease (no change) CHINHI 0.56 M o t increase o decrease no change CH CO 0.27 M o t increase decrease no change CHNH 0.63 M t increase o decrease o (no change) CH Co, 1.25 M t increase o decrease (no change) CHINHI 1.29 M t increase o decrease no change

Explanation / Answer

HCH3CO2 (aq) +CH3NH2 (aq) CH3COO2(aq) +CH3NH+3 (aq)

Qc = [CH3COO^-][CH3NH3^+]/[CH3COOH][CH3NH2]

Calue of Qc in reaction vessel A :

Qc = 0.89 *0.93/ 0.63 *0.99 = 1.33

Qc = Kc

No change in concentration of four component

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in reaction veesel B :

Qc = 0.52 *0.56/ 1.36*1.00 = 0.214

Qc< Kc

So, CH3COO- and Ch3NH3+ increases and Ch3COOH and CH3NH2 decreases.

------------------------------------------

Reaction vessel 3 :

Qc = 1.25*1.29/ 0.27 *0.63 = 9.48

Qc>Kc

concentration of Ch3COOH and Ch3NH2 will increase and concentration of CH3COO- and CH3NH2+ will decrease

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