pH and van’t hoff
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 59
- Joined: Fri Sep 28, 2018 12:19 am
pH and van’t hoff
why would the neutral ph change from 7 in a chemical reaction and how is that possible?
-
- Posts: 62
- Joined: Fri Sep 28, 2018 12:19 am
- Been upvoted: 1 time
Re: pH and van’t hoff
The neutral pH can change with temperature, because pH is not constant with temperature.
-
- Posts: 60
- Joined: Fri Sep 28, 2018 12:27 am
Re: pH and van’t hoff
With a temperature change, the K changes, so then the pH would also change because the concentration of H+ changes.
-
- Posts: 61
- Joined: Fri Sep 28, 2018 12:29 am
Re: pH and van’t hoff
When temperature increases, the Kw increases as well, which causes the neutral [H+] to increase and neutral pH to decrease. On the flip side, when temperature decreases, the Kw and neutral [H+] decrease, so the neutral pH increases. Neutral pH of 7 is only true at 298K.
Re: pH and van’t hoff
Joonsoo Kim 4L wrote:When temperature increases, the Kw increases as well, which causes the neutral [H+] to increase and neutral pH to decrease. On the flip side, when temperature decreases, the Kw and neutral [H+] decrease, so the neutral pH increases. Neutral pH of 7 is only true at 298K.
Thank you this is very helpful!
-
- Posts: 32
- Joined: Mon Apr 09, 2018 1:38 pm
Re: pH and van’t hoff
Thank you, this was a big help in figuring out where I went wrong on the Vant Hoff problem on test 2
-
- Posts: 39
- Joined: Fri Sep 28, 2018 12:17 am
Re: pH and van’t hoff
A neutral pH of 7 is only true for water at 25 degrees celsius. As the temperature changes, Kw changes and therefore as [h30+] is calculated by taking the square root of Kw, the neutral pH value will differ accordingly.
Return to “Van't Hoff Equation”
Who is online
Users browsing this forum: No registered users and 1 guest