PH > 14 ?

[Primarygun]

I know there is nothing's pH value is greater than 14.

But, if a compound ionizes the fastest, 1 mole of it into one 1 of water ,will the pH 15 exist?

[Gilded]

1mol of OH- in a liter of water = pH 14. I can't see why it couldn't be > 14.

[YT2095]

you can`t just get the OH ion to exist alone though.

 

and the PH scale like Paulings, is arbitrary at best anyway

[J'Dona]

Solutions can have pH's above 14 and below 0, the concentrations are just nasty and hard to reach. A 15 pH solution would have an OH^- concentration of 10 mol dm^-3, which is possible, just dangerous and reaching the limits of how many OH^- ions can dissolve in the water. Eventually there are too many ions and the water won't accept any more, same for either H⁺ or OH^- ions.

 

I don't know why you might call it artbitrary since it's based on a normal logarithmic formula: pH = -log₁₀[H⁺]

[Sayonara]

I think he means arbitrary in the sense that we could call the extremes "infra red" and "ultra violet" instead of 0 and 14.

[pulkit]

pH below 0 and above 14 are not nice things and most often you do not deal with such solutions.

 

In most cases, the pH values between 0 and 14 suffice for all sane discussions about solutions/acids/bases/buffers etc..

[Primarygun]

What's the water dissociation constant?

I forgot. I forgot if the constant is still constant when something else is dissolved into it.

Can anyone tell me?

Also, what's the pH value of "alien"'s blood?

[pulkit]

constant you are lookign for = 10^{-14}

 

wtf is alien'sblood ?

[Gilded]

I think he means the alien from the movie Alien, and if we were to make a similar acid. Seems like some sort of super acid to me, that can dissolve steel with ease. Some of the super acids don't even have a pH function defined yet.

[Primarygun]

10^{-14}

Thank you pullkit.

What shall we do at once if we are unluckily stained with those super acid?

[YT2095]

Thank you pullkit.

What shall we do at once if we are unluckily stained with those super acid?

that all depends on what the acid is, but most of the time Neutralising it with a suitable Base and then washing it off with plenty of water and then seeking medical advice will suffice

[Primarygun]

Neutralising it with a suitable Base

Base but not alkali?

[Chintamani]

pH value is actually -log{H} . i.e. negative log of hydrogen ion concentration in water.

pH value of 0 and 14 can never be achieved because at pH 0 solutionwill contain only

Hydrogen ions and @ pH 14 it will contain only -OH ions.

[ed84c]

Base but not alkali?

 

not soluble

[ed84c]

strongest possible acid;

http://www.scienceforums.net/forums/showthread.php?t=2875&highlight=strongest+acid

[budullewraagh]

well, that wouldnt happen as you would need anions in the mix.....pentafluoroantimonic acid is the strongest according to dissociation constant

[ed84c]

long chemicalese words i dont understand! plz clarify

[budullewraagh]

you couldnt have floating protons without some sort of negative anions in the mix. thus you cannot hav a bunch of protons just sitting around. in terms of dissociation constant (how much of the acid dissociates) a solution of HF in SbF5 is the strongest acid

[hyebeh]

a pH lower than 0 and higher than 14 is possible. pH is caused by the natural dissociation of water. Bases and Acids change this natural dissociation by adding OH or H ions or accepting OH or H ions. As these substance bind to OH or H or give off OH or H. The OH and H molecules begin to bond more frequently or less frequently to form water. (e.g. if a substance is very acidic and creates lots of H ions, these ions would collide more frequently with OH ions and form water. Thus, the OH count is lowered while H count is increased by the substance) Therefore, it is possible for a substance to raise the OH or H count enough to go beyond 0 or 14. However, such a solution would be highly reactive and wouldn't last long in open air.

[budullewraagh]

and by the very nature of the mathematics of it.....ph is the negative log for the concentration of hydronium cations. this can be negative, and thus the pOH can be greater than 14. same thing works in the opposite way with pH