Kw Question A Level Chem

https://www.quora.com/profile/Bravewarrior/p-148537057
Here is the question and its answer. I am stuck on 6d. Can someone please explain the answer for it? Thank you so much!

Reply 1

Sakai04

Kw is endothermic, thus positive, as it increases with temperature

Reply 2

charco

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Original post

by Sakai04

Kw is endothermic, thus positive, as it increases with temperature

Kw is an equilibrium constant - it can't be negative!

Reply 3

charco

Study Forum Helper

Original post

by pigeonwarrior

https://www.quora.com/profile/Bravewarrior/p-148537057
Here is the question and its answer. I am stuck on 6d. Can someone please explain the answer for it? Thank you so much!

Kw increases with temperature.

Kw = [products]^coeff/[reactants]^coeff

This means at higher temperatures there are more products i.e. the equilibrium lies more to the RHS.

Hence the forward reaction is endothermic, ΔH is positive.

(edited 2 years ago)

Reply 4

pigeonwarrior

Original post

by Sakai04

Kw is endothermic, thus positive, as it increases with temperature

Ohhh ok yes this makes sense now, thank you!

Reply 5

pigeonwarrior

Original post

by charco

Thank you so much for this! It makes much more sense now 🙂

Reply 6

pigeonwarrior

Also have they just included 25 degrees to illustrate their point about Kw increasing with temperature? As 25 degrees is not mentioned int he question anywhere