December 22, 2024, 10:01:38 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: pH exceeding the limit  (Read 11000 times)

0 Members and 2 Guests are viewing this topic.

Offline victor

  • Regular Member
  • ***
  • Posts: 84
  • Mole Snacks: +2/-0
  • Gender: Male
  • I'm a cat!
pH exceeding the limit
« on: November 28, 2005, 08:15:31 AM »
I oftenly argue with some of the chemistry people (because I'm a biology people) that is there any pH that minus??
My lecturer said that the limitation of pH must be between 0 - 14. But, how about high concentrated acids?? if we calculate it, we'll get a minus in pH right??
Now, how about calculating high concentrated bases?? could we get pH>14 (e.g. 16 or 17)??
Logged

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7976
  • Mole Snacks: +555/-93
  • Gender: Male
Re:pH exceeding the limit
« Reply #1 on: November 28, 2005, 08:21:46 AM »
pH of water solutions can be slightly less than 0 or slightly greater than 14
« Last Edit: November 28, 2005, 08:22:04 AM by AWK »
Logged
AWK

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27885
  • Mole Snacks: +1815/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re:pH exceeding the limit
« Reply #2 on: November 28, 2005, 08:30:35 AM »
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Bakegaku

  • Full Member
  • ****
  • Posts: 269
  • Mole Snacks: +20/-5
  • Gender: Male
  • Hydrogen peroxide is my miracle cure to everything
Re:pH exceeding the limit
« Reply #3 on: November 29, 2005, 03:25:44 PM »
I think I remember reading in Guiness World Records, for most acidic water, they found some water in a mine with a pH of about -3.5.

Considering that's supposedly the most acidic I guess there's not too much you can do to make it go lower... ::)
Logged
"True knowledge exists in knowing that you know nothing"
-Socrates

"I see, I forget.  I hear, I remember.  I do, I understand"
-Confucius

"Nothing will benefit human health and increase chances for survival of life on Earth as much as the evolution to a vegetarian diet."
- Albert Einstein?

"American cartoons place characters in situations; anime
places situations around characters.  Anime characters
are not like fictional characters but more like fictional
people; their actions stem directly from their personalities,
and not just as a means to move the story's plot
forward.  We are made to sympathize with them, and
not simply be entertained by them."
~John Oppliger~

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27885
  • Mole Snacks: +1815/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re:pH exceeding the limit
« Reply #4 on: November 29, 2005, 03:29:23 PM »
Quote from: bakegaku on November 29, 2005, 03:25:44 PM
they found some water in a mine with a pH of about -3.5

Just remember we are talking about activity scale, not concentration scale!
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline lemonoman

  • Atmospheric
  • Chemist
  • Full Member
  • *
  • Posts: 607
  • Mole Snacks: +71/-8
  • Gender: Male
Re:pH exceeding the limit
« Reply #5 on: November 30, 2005, 02:18:37 AM »
Quote from: Borek on November 29, 2005, 03:29:23 PM
Just remember we are talking about activity scale, not concentration scale!

Oh yeeeeeaaaaahhhhh...so Ionic strength, etc. will play a role!
Logged

Offline constant thinker

  • mad scientist
  • Sr. Member
  • *****
  • Posts: 1275
  • Mole Snacks: +85/-45
  • Gender: Male
Re:pH exceeding the limit
« Reply #6 on: December 01, 2005, 09:03:04 PM »
Also faulty/not calibrated equipment.

I got a pH reading from an uncalibrated sensor of -10.3 in a solution that should've only been 2.
Logged
"The nine most terrifying words in the English language are, 'I'm from the government and I'm here to help.' " -Ronald Reagan

"I'm for anything that gets you through the night, be it prayer, tranquilizers, or a bottle of Jack Daniels." -Frank Sinatra

Offline mike

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1245
  • Mole Snacks: +121/-35
  • Gender: Male
Re:pH exceeding the limit
« Reply #7 on: December 01, 2005, 09:05:02 PM »
Quote
Also faulty/not calibrated equipment.

I got a pH reading from an uncalibrated sensor of -10.3 in a solution that should've only been 2.

is this a random or systematic error?
Logged
There is no science without fancy, and no art without facts.

Offline constant thinker

  • mad scientist
  • Sr. Member
  • *****
  • Posts: 1275
  • Mole Snacks: +85/-45
  • Gender: Male
Re:pH exceeding the limit
« Reply #8 on: December 01, 2005, 09:08:53 PM »
Just a random error I guess. I was astounded to see -10 at first. Then after calibration it went to normal.
Logged
"The nine most terrifying words in the English language are, 'I'm from the government and I'm here to help.' " -Ronald Reagan

"I'm for anything that gets you through the night, be it prayer, tranquilizers, or a bottle of Jack Daniels." -Frank Sinatra

Offline mike

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1245
  • Mole Snacks: +121/-35
  • Gender: Male
Re:pH exceeding the limit
« Reply #9 on: December 01, 2005, 09:33:58 PM »
In fact this would be a systematic error.

You could still take precise measurments with the pH metre they would not be accurate though. :)
Logged
There is no science without fancy, and no art without facts.

Offline victor

  • Regular Member
  • ***
  • Posts: 84
  • Mole Snacks: +2/-0
  • Gender: Male
  • I'm a cat!
Re:pH exceeding the limit
« Reply #10 on: December 02, 2005, 06:20:54 AM »
Quote from: lemonoman on November 30, 2005, 02:18:37 AM
Oh yeeeeeaaaaahhhhh...so Ionic strength, etc. will play a role!

do not think that all ionic acids would give the highest acid level....the newly invented acid molecule named carborant acid have the acid level exceeding hundreds times greater compared to high concentrated sulphate acid...and carborant acid have the molecular name for CHB11Cl11...bonded covalently... ;D
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links