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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: kimisizer on February 17, 2011, 07:59:48 PM

Title: Factors that affect K in equilibrium?
Post by: kimisizer on February 17, 2011, 07:59:48 PM
Out of these factors, which ones change the value of K?
Volume
Pressure
Temperature
Initial concentration
Chemical equation

This was from an online review and they only gave a number (2) but I thought it was 3: Temperature, volume and pressure. Doesn't changing volume also change pressure thereby changing k, leading to a change in K?
Title: Re: Factors that affect K in equilibrium?
Post by: opti384 on February 17, 2011, 08:47:51 PM
K is only affected by temperature.
Title: Re: Factors that affect K in equilibrium?
Post by: kimisizer on February 17, 2011, 09:17:35 PM
Quote from: opti384 on February 17, 2011, 08:47:51 PM
K is only affected by temperature.

Actually, pressure also affects K because if pressure was increased, the reaction would shift to the side with less molecules until equilibrium is reached.
Title: Re: Factors that affect K in equilibrium?
Post by: opti384 on February 17, 2011, 10:05:09 PM
Quote
Actually, pressure also affects K because if pressure was increased, the reaction would shift to the side with less molecules until equilibrium is reached.

And why do you think like that?
Title: Re: Factors that affect K in equilibrium?
Post by: DevaDevil on February 18, 2011, 10:31:08 AM
K is indeed Temp dependent (van ;t Hoff relation)

Kp is also pressure dependent (in case of non-ideal gas / non gaseous matter)




Quote from: kimisizer on February 17, 2011, 09:17:35 PM
Actually, pressure also affects K because if pressure was increased, the reaction would shift to the side with less molecules until equilibrium is reached.

this is not a change in Kp, but a change in reactant and product mixture (le Chatelier's principle)
Title: Re: Factors that affect K in equilibrium?
Post by: AMEDIO on February 19, 2011, 01:05:54 AM
K depends only on temp.