pH scale limitations
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 104
- Joined: Fri Sep 24, 2021 5:08 am
Re: pH scale limitations
Technically speaking, it can go above 14, but commonly we do not have to deal with this. It only ranges from 0 to 14 in most cases and is that way because of the use of -log to make the number easier to work with and to differentiate between acids and bases.
-
- Posts: 126
- Joined: Fri Sep 24, 2021 5:10 am
Re: pH scale limitations
Hi,
For the scale we use, I believe it refers to the temperature 25 degrees Celsius and the scale of 0 to 14 for pH is the standard. There are possibilities where the pH can go below 0 for very strong acids or above 14 for very strong bases. As far as I know, we would not have to worry about calculations outside of the range for the course.
For the scale we use, I believe it refers to the temperature 25 degrees Celsius and the scale of 0 to 14 for pH is the standard. There are possibilities where the pH can go below 0 for very strong acids or above 14 for very strong bases. As far as I know, we would not have to worry about calculations outside of the range for the course.
-
- Posts: 104
- Joined: Fri Sep 24, 2021 6:52 am
Re: pH scale limitations
I think the textbook said that pH can be smaller than 0 and bigger than 14, but it won't appear in our course.
-
- Posts: 108
- Joined: Fri Sep 24, 2021 6:45 am
Re: pH scale limitations
305561744 wrote:Can something have a pH above 14? How would that affect calculations?
Super acids can have a ph above 14. They have extremely great proton donating abilities.
-
- Posts: 190
- Joined: Fri Sep 24, 2021 5:50 am
- Been upvoted: 3 times
Re: pH scale limitations
Hi,
Dr. Lavelle stated in the 01/10 lecture that the pH scale from 0 to 14 characterizes most acids and bases. However, super acids and super bases, which have pH values beyond the conventional 0 to 14 scale, are not covered in this course.
For your reference, a super acid contains a hydronium (H3O+) concentration greater than 1 M, resulting in a negative pH value. Conversely, a super base contains a hydroxide (OH-) concentration greater than 1 M, resulting a pH value above 14.
Dr. Lavelle stated in the 01/10 lecture that the pH scale from 0 to 14 characterizes most acids and bases. However, super acids and super bases, which have pH values beyond the conventional 0 to 14 scale, are not covered in this course.
For your reference, a super acid contains a hydronium (H3O+) concentration greater than 1 M, resulting in a negative pH value. Conversely, a super base contains a hydroxide (OH-) concentration greater than 1 M, resulting a pH value above 14.
-
- Posts: 110
- Joined: Fri Sep 24, 2021 5:28 am
Re: pH scale limitations
While there are solutions that are capable of being superacids and superbases that have PH's lower than 0 and higher than 14, the PH scale that encompasses most acids and bases in this course goes from 0-14
-
- Posts: 104
- Joined: Fri Sep 24, 2021 5:11 am
Re: pH scale limitations
When we say that the pH scale is between 1-14 we are just generalizing the typical pH we deal with. This meaning that a pH can be above or below this range but they are not seen as much.
-
- Posts: 103
- Joined: Fri Sep 24, 2021 7:03 am
Re: pH scale limitations
It is possible to exceed the 14 scale, but it is rare, and the 1-14 encompasses most acids and bases for adequate and accurate measurement.
-
- Posts: 102
- Joined: Fri Sep 24, 2021 5:48 am
Re: pH scale limitations
It is possible, but for the calculations in this course the pH will be within 0-14.
-
- Posts: 52
- Joined: Mon Jan 03, 2022 9:35 pm
Re: pH scale limitations
It is possible for the pH of a solution to go beyond 0 and 14, but I believe we only have to deal with pH values within the range from 0 to 14 for this course.
-
- Posts: 100
- Joined: Fri Sep 24, 2021 5:41 am
Re: pH scale limitations
the pH scale doesn't have fixed limits so pH can go above 14 and below 0 too.
-
- Posts: 101
- Joined: Fri Sep 24, 2021 6:07 am
Re: pH scale limitations
If a base dissociates in water and leads to a concentration of OH- greater than 1M, calculating the POH through taking the -log leads to a negative number. Then, calculating PH through 14-POH leads to a number greater than 14.
-
- Posts: 104
- Joined: Fri Sep 24, 2021 5:53 am
Re: pH scale limitations
Although pH can be smaller than 0 or bigger than 14, this will never appear in our course.
-
- Posts: 107
- Joined: Fri Sep 24, 2021 5:38 am
Return to “Non-Equilibrium Conditions & The Reaction Quotient”
Who is online
Users browsing this forum: No registered users and 11 guests