Concentrations of products/reactants

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Miriam Sheetz 2B
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Concentrations of products/reactants

Postby Miriam Sheetz 2B » Mon Jan 07, 2019 8:17 pm

Is the equilibrium constant K the ratio of the initial or equilibrium concentrations of the products and reactants?

Elisa Bass 4L
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Re: Concentrations of products/reactants

Postby Elisa Bass 4L » Mon Jan 07, 2019 8:19 pm

It is a ratio of the equilibrium concentrations.

marisaimbroane1J
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

Re: Concentrations of products/reactants

Postby marisaimbroane1J » Mon Jan 07, 2019 8:31 pm

Since K is the equilibrium expression, you use the concentrations at equilibrium. The initial concentrations can be used to do other calculations like with weak acids and bases.

Ian Marquez 2K
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Re: Concentrations of products/reactants

Postby Ian Marquez 2K » Tue Jan 08, 2019 3:08 pm

K is the equilibrium constant so the numbers you use are the equilibrium concentrations of the products and reactants. This tells you that this ratio will be approached when a reaction reaches equilibrium from its initial concentrations.

Alexa Tabakian 1A
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Re: Concentrations of products/reactants

Postby Alexa Tabakian 1A » Tue Jan 08, 2019 4:21 pm

Q would be anything other than equilibrium, and K is the equilibrium.

Anna O 2C
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Re: Concentrations of products/reactants

Postby Anna O 2C » Tue Jan 08, 2019 5:02 pm

Adding on, K is referring to the concentrations held to the specific power and ratio as stated in the balanced equilibrium equation given in the problem. Knowing the concentrations won't do you any good if they aren't held to the correct power within the fraction for K.

Felicia1E
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Re: Concentrations of products/reactants

Postby Felicia1E » Tue Jan 08, 2019 6:12 pm

It also matters if it's Kc or Kp. While Kc does refer to the ratio of concentrations to their respective powers of products and reactants, Kp will refer to the ratio of partial pressures to their respective powers of products and reactants.


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