converting Kc to Kp
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converting Kc to Kp
when using the ideal gas equation to convert Kp to Kc, do we need to know the volume, or do we just keep our value in molar and omit knowing the volume?
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Re: converting Kc to Kp
If you know the molar concentration, you technically do know volume because molar concentration is mol per liter. For example, if there is 0.3 mol/L of a reactant, that means the volume is one liter. Hope that answered your question!
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Re: converting Kc to Kp
For our purpose, we are mainly using the ideal gas equation to convert between concentration and partial pressure for a gas so I don't believe it's necessary to know the volume.
Re: converting Kc to Kp
the volume is already included in the concentration as it is moles over volume
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Re: converting Kc to Kp
What exactly is the difference between Kc and Kp? I know (or think) they are equilibria constants but what do they individually represent?
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Re: converting Kc to Kp
Megan Kirschner wrote:What exactly is the difference between Kc and Kp? I know (or think) they are equilibria constants but what do they individually represent?
Kc is used for the concentration of aqueous solutions and gases while Kp is for the partial pressures of gases
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Re: converting Kc to Kp
When asked the equilibrium constant of a chemical reaction involving gases, do we solve for Kc or Kp?
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Re: converting Kc to Kp
Kc is calculated using molar concentration while Kp is calculated using partial pressures. To convert from Kc to Kp, use the equation PV=nRT. We know that the molar concentration is calculated by n/V so this equation can be manipulated to find the concentration which is concentration = n/V= P/RT. For gases, use partial pressures to calculate the K constant, unless the question specifically asks you to find Kc. For aqueous solutions, use molar concentrations to find the K constant.
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Re: converting Kc to Kp
Naren_Ramesh_4F wrote:When asked the equilibrium constant of a chemical reaction involving gases, do we solve for Kc or Kp?
The question will probably ask what to solve for; either Kc or Kp, because for gases you can solve for either. if they give you partial pressures in the question than solve for Kp and if they give you concentrations than solve for Kc. K is unitless so it shouldn't matter
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Re: converting Kc to Kp
Naren_Ramesh_4F wrote:When asked the equilibrium constant of a chemical reaction involving gases, do we solve for Kc or Kp?
If the reaction involves gases, we will most likely be solving for Kp unless the question specifically asks us for Kc, in which case we will need to convert from Kp to Kc.
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Re: converting Kc to Kp
is it better to convert all values of Kc to Kp before continuing to solve a problem (making an ICE table and so on...) using the ideal gas equation, or is it better to do it as the textbook instructs?
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Re: converting Kc to Kp
Naren_Ramesh_4F wrote:When asked the equilibrium constant of a chemical reaction involving gases, do we solve for Kc or Kp?
You would solve for Kp since the P stands for partial pressure. Remember that if they ask for the equilibrium constant of a gas always assume you use Kp unless stated otherwise.
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Re: converting Kc to Kp
If you know the molar concentration, then you should technically be able to figure out the volume.
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