25 degrees celsius  [ENDORSED]

Moderators: Chem_Mod, Chem_Admin

Sandra Kim 2B
Posts: 93
Joined: Wed Sep 30, 2020 9:50 pm

25 degrees celsius

Postby Sandra Kim 2B » Tue Dec 08, 2020 2:04 am

What's the importance of saying that the solution is at 25 degrees celsius? I've seen it in a lot of problems on calculating pH and I was not sure why it specified that.

VanessaZhu2L
Posts: 90
Joined: Wed Sep 30, 2020 9:44 pm

Re: 25 degrees celsius

Postby VanessaZhu2L » Tue Dec 08, 2020 2:21 am

I think it is just a standard temperature, like room temperature. Since extreme temperatures can affect reactions and stuff, it just indicates that it isn't too hot or cold.

Shrey Pawar 2A
Posts: 96
Joined: Wed Sep 30, 2020 9:42 pm
Been upvoted: 3 times

Re: 25 degrees celsius

Postby Shrey Pawar 2A » Tue Dec 08, 2020 9:05 am

For us right now the 25 degrees celsius is not important, it is just clarifying that the pH is not affected by outside variables like temperature I believe. Hope this helps!

Stacey Phan 2I
Posts: 100
Joined: Wed Sep 30, 2020 9:59 pm
Been upvoted: 1 time

Re: 25 degrees celsius

Postby Stacey Phan 2I » Wed Dec 09, 2020 1:05 pm

pH decreases as temperature increases. In pure water at 25 °C, the molar concentrations of [H3O+] and [OH-} are equal (the liquid is electrically neutral overall). Therefore, 25 °C is the only temperature we consider, unless otherwise stated.

emilyyribarren1k
Posts: 56
Joined: Wed Sep 30, 2020 10:10 pm
Been upvoted: 1 time

Re: 25 degrees celsius

Postby emilyyribarren1k » Wed Dec 09, 2020 1:13 pm

I ignored the temperature when doing the homework problems and it didn't seem to matter so I don't think it's important.

Crystal Pan 2G
Posts: 112
Joined: Wed Sep 30, 2020 10:04 pm
Been upvoted: 2 times

Re: 25 degrees celsius

Postby Crystal Pan 2G » Wed Dec 09, 2020 1:40 pm

25 degrees is considered the standard, much like we consider room temperature.

Chem_Mod
Posts: 19542
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 882 times

Re: 25 degrees celsius  [ENDORSED]

Postby Chem_Mod » Wed Dec 09, 2020 2:16 pm

Sandra Kim 2B wrote:What's the importance of saying that the solution is at 25 degrees celsius? I've seen it in a lot of problems on calculating pH and I was not sure why it specified that.


You'll learn more about this topic in Chem 14B when we learn about the effect of temperature on equilibrium. At 25 degrees Celsius, the pH of neutral water is 7. Changing the temperature actually changes the pH at which water is neutral! For now though, assume the temperature is 25 degrees Celsius.


Return to “Calculating pH or pOH for Strong & Weak Acids & Bases”

Who is online

Users browsing this forum: No registered users and 2 guests