Textbook Problem 5G. 1

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Marcus Lagman 2A
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Textbook Problem 5G. 1

Postby Marcus Lagman 2A » Fri Jan 08, 2021 11:20 am

Hello!

I am having a hard time understanding the answers to the last two problems (c and d).

The question is asking to state whether the following statements are true or false and to explain if false.
(c) If one starts with a higher pressure of reactant, the equilibrium constant will be larger.

(d) If one starts with higher concentrations of reactants, the equilibrium concentrations of the products will be larger.

I looked at the answers and it gave me false and true respectively. If someone were to give me an example of each one that would be most appreciated! Thank you!

Rachel Jiang 3H
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Re: Textbook Problem 5G. 1

Postby Rachel Jiang 3H » Fri Jan 08, 2021 11:33 am

For c, the equilibrium consonant is only affected by temperature. Increasing the concentration or partial pressure will not change the value of the equilibrium constant.

For d, remember that the equilibrium constant does not change even when the concentration of reactants increases. If the initial concentration of reactants increases, the equilibrium concentration of products must be higher in order for K to remain the same.

Hope this helps!

Andrew Wang 1C
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Re: Textbook Problem 5G. 1

Postby Andrew Wang 1C » Fri Jan 08, 2021 11:35 am

For (c), the equilibrium constant will not change due to an increase in pressure (or concentration) on one side of the reaction. Equilibrium constants for reactions only change if the temperature is changed.

For (d), according to Le Chatlier's principle, if you start with a higher concentration on one side, the reaction will shift towards the other side. In this case, a higher concentration of reactants means the reaction will shift towards the products to be at equilibrium. So the concentration of products will be greater at equilibrium than when you started.

Rajshree 1F
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Re: Textbook Problem 5G. 1

Postby Rajshree 1F » Sat Jan 09, 2021 10:18 am

for c, only temperature affects the equilibrium constant. for d, the concentration of reactants would lead to an increase in products but the equilibrium constant (K) would stay the same. for example whether u have Kc = 5/1 or 10/2 it still equals 5. hope this helps.

Leyla Anwar 3B
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Re: Textbook Problem 5G. 1

Postby Leyla Anwar 3B » Sat Jan 09, 2021 4:43 pm

Something to remember here is that, yes while temperature causes a change in K, if the pressure is changed by a change in volume, then K would change as well (because concentration is changing). That is not the case for C but just to remind you. And for D, like others have stated, because of Le Chatlier's Principle, the reaction will strive to balance itself back out so if it increases on one side it will increase on the other so that ratio of K is the same as originally.


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