Relationship between K and Q

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Angela Velazquez 1J
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Relationship between K and Q

Postby Angela Velazquez 1J » Thu Nov 12, 2015 5:16 pm

What is the relationship between K and Q? What is the difference if they are calculated the same way?

Chem_Mod
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Re: Relationship between K and Q

Postby Chem_Mod » Thu Nov 12, 2015 8:51 pm

You can read about the difference and similarity between K and Q in the textbook on pages 432-433 or in the course reader pages 124-125.

Jana Sandhu 3J
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Re: Relationship between K and Q

Postby Jana Sandhu 3J » Thu Nov 12, 2015 10:00 pm

You are correct about K and Q being calculated in the same way. From what I've been seeing, in questions involving Q, K is usually given and you are asked to find Q in order to determine whether or not the reaction is at equilibrium and in what way the reaction will occur to approach equilibrium. I can't think of a case in which Q would be involved in a question without the value of K already being given.

Tiffany Tam
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Re: Relationship between K and Q

Postby Tiffany Tam » Fri Nov 13, 2015 8:50 pm

K is a constant that never changes which allows you to compare it to Q to determine the state of a reaction. So when Q<K the reaction tends to move towards the products, when Q=K the reaction is in equilibrium, and when Q>K the reverse reaction is spontaneous.


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