You are Here: Home

# Would changing volume have an effect on Kc? watch

1. Kc involves concentration which depend on volume so shouldn't changing volume have an effect on Kc if volume is altered? Unless of course the volume cancels out in the equation anyway
Kc involves concentration which depend on volume so shouldn't changing volume have an effect on Kc if volume is altered? Unless of course the volume cancels out in the equation anyway
Kc is temperature dependent, so changing the temperature will change its value. The type of change depends on whether it's an exothermic or endothermic reaction.

If the reaction is exothermic, increasing the temperature will reduce Kc and vice-verca. This is because if you increase the temp., you drive the equilibrium backwards (in the endothermic direction), and therefore increase the concentration of reactants and decrease the concentration of products.

If endothermic, increasing the temperature will increase Kc, and vice-verca.
3. (Original post by remaincalm444)
Kc is temperature dependent, so changing the temperature will change its value. The type of change depends on whether it's an exothermic or endothermic reaction.

If the reaction is exothermic, increasing the temperature will reduce Kc and vice-verca. This is because if you increase the temp., you drive the equilibrium backwards (in the endothermic direction), and therefore increase the concentration of reactants and decrease the concentration of products.

If endothermic, increasing the temperature will increase Kc, and vice-verca.
I am talking about the effect of volume on Kc. Say a reaction happens at T temperature in a certain volume. If a second reaction happens in the same temperature T with the same amount of reagents but in a larger volume container, how will this affect the Kc.
4. Kc is unaffected by changes in volume, concentration or pressure.

Only changes in temperature will affect the value of Kc.

And Kp, Kw K etc.
5. Kc is a ratio of concentrations. Because changing the volume affects the concentrations of all solutes equally, changing the volume does not affect Kc.

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 9, 2017
Today on TSR

### Exam Jam 2018

Join thousands of students this half term

### Solo - A Star Wars Story

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE