You are Here: Home

# A Level Chemistry - Kc Calculations Watch

I've done it quite simply which probably means what I have done is wrong!

Calculate Kc for the following equilibrium at a particular temperature, given the results of an analysis of the equilibrium mixture which show that the concentration of SO2 = 0.23, O2 = 1.37, and SO3 = 0.92 mol dm-3.
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

You can also find the Exam Thread list for A-levels here and GCSE here.

Just quoting in Puddles the Monkey so she can move the thread if needed
Spoiler:
Show
(Original post by Puddles the Monkey)
x
3. (Original post by emfrostyy)
I've done it quite simply which probably means what I have done is wrong!

Calculate Kc for the following equilibrium at a particular temperature, given the results of an analysis of the equilibrium mixture which show that the concentration of SO2 = 0.23, O2 = 1.37, and SO3 = 0.92 mol dm-3.
No, it's simple.

Put the values into the equilibrium expression corresponding to the equation for the reaction.
4. I got 11.67 which looks wrong but ...
5. (Original post by Notthemainguy)
I got 11.67 which looks wrong but ...
Why does it "look" wrong ...

... just curious, like.
6. I'm not used to seeing kc that ...big usually its less than 1
7. (Original post by Notthemainguy)
I'm not used to seeing kc that ...big usually its less than 1
Equilibrium constants can range from 0 to infinity.

You can look at an equilibrium from either direction, if kc is very small in one direction it must be very large in the reverse direction.

The equilibrium constant for hydrolysis of an ester is about 4 then the constant for the esterification reaction is 0.25 (for example)

kforward = 1/kback
8. Oh because you'd get the reciprocal of the quotient

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: November 15, 2016
Today on TSR

...in schools

### I think I'm transgender AMA

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• 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

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.