Calculating Kc

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Jaira_Murphy_2D
Posts: 15
Joined: Fri Apr 06, 2018 2:00 am

Calculating Kc

Postby Jaira_Murphy_2D » Fri Jan 11, 2019 11:41 pm

Can someone please explain to me why it’s necessary to balance a reaction equation when calculating Kc? I don’t understand why it mattters if concentration changes dont affect Kc.

Chem_Mod
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Re: Calculating Kc

Postby Chem_Mod » Fri Jan 11, 2019 11:44 pm

The chemical equation needs to be balanced becasue in the equilibrium equation, each species is raised to the power of its stoichiometric coefficient (which is obtained from the balanced chemical equation).

MichelleTran 1I
Posts: 31
Joined: Thu Sep 27, 2018 11:23 pm

Re: Calculating Kc

Postby MichelleTran 1I » Sat Jan 12, 2019 12:01 am

Though the concentrations don't affect Kc, the coefficients in a balanced equation are needed to calculate the equilibrium constant. You need to raise the concentrations to the power of how many mols are in the reaction.

katie_sutton1B
Posts: 49
Joined: Thu Sep 27, 2018 11:17 pm

Re: Calculating Kc

Postby katie_sutton1B » Sat Jan 12, 2019 8:58 am

Blanking an equation gives you the correct stoichiometric values for the equation. This is important because you have to raise the concentration of a species to its stoichiometric concentration to get the correct Kc

005115864
Posts: 55
Joined: Thu Sep 27, 2018 11:15 pm

Re: Calculating Kc

Postby 005115864 » Sat Jan 12, 2019 9:38 am

Using the balanced equation is imperative because the stoichiometric coefficients are needed in order to solve for KC as they are what you raise each concentration to the power of. Therefore you need the correct balanced ratio for each reaction and the stoichiometric coefficients are necessary.


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