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Postby taline_n » Wed Jan 09, 2019 9:24 am

When asked to write out the equilibrium constant for an equation, is Kp or Kc preferred?

Kelsey Warren 1I
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Re: K

Postby Kelsey Warren 1I » Wed Jan 09, 2019 9:37 am

I'm pretty sure that when you're dealing with gases, you use partial pressures to calculate K, so you'd use Kp. When you're using aqueous compounds, etc., so you're plugging in concentrations into your calculation for K, you'd use Kc.

Courtney McHargue 1I
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Re: K

Postby Courtney McHargue 1I » Wed Jan 09, 2019 10:18 am

If you're dealing with solutions that have a given concentration, then you use Kc, but if you're dealing with gases and partial pressures, you use Kp.

Hannah Pham 1D
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Re: K

Postby Hannah Pham 1D » Wed Jan 09, 2019 10:25 am

Kc is used when the units of the equilibrium concentrations are moles per liter. Kp is used when using partial pressure. It’s basically the same thing but with different units.

JT Wechsler 2B
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Re: K

Postby JT Wechsler 2B » Wed Jan 09, 2019 10:45 am

You will use Kc when asked about concentrations (molarity) and Kp when asked about the partial pressures of gases.

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