Why pH value is not above 14?

Answer 1

pH is a scale that was introduced by sorenson. The terms pH and pOH literally means potenz (strength) of hydrogen ions. Thus, it can be measured for any compound that can be ionized to give these ions in there aqueous solutions and not for other compounds.

Answer 2

pH scale is designed to measure the concentration of hydrogen ions in a solution on a scale from 0 to 14. A pH above 14 would indicate a hypothetical concentration of hydrogen ions that is not physically possible in aqueous solutions. The highest pH achievable in water is 14, representing a solution that is extremely basic.

Answer 3

Actually some pH values are above 14. Just as some acidic chemicals can have a pH below 1 (like battery acid). I am afraid i can not give you a example of something with a pH above 14 but i am pretty sure there are somethings out there! Hope this helped!

Answer 4

The equation for finding the pH of a solution is -log([H+]). That is, the negative log of the molarity of the hydrogen ions released by the compound in solution. Almost no chemicals can release hydrogen ions with a molarity greater than 1 or less than 10^-14. however, there are some rare cases where the pH of a solution is not between 0 and 14. For example, 10 molarity hydrochloric acid (there are ten moles of hydrochloric acid for every liter of water.), has a pH of -1 (-log(10) =-1). But these are so rare in occurence, that they generally disregard it.

Answer 5

The pH of a substance is not necessarily within the range of 0-14, although this is very rare.

First, I would like to introduce a term called the "ionic product of water". When pure water at room temperature and pressure ionizes to form equal amounts of OH- and H+ ions, the product of the concentrations of the two ions equals 10-14 .

[OH-]x[H+] = 10-14

Since the concentrations are equal, it can be said that [H+] = [OH-] = 10-7 .

Next, I would like to remind you that pH = -log [H+] .

Since [H+] = 10-7 , pH of water at RTP is 7, which means neutral.

Now, to your question. You can take the negative logarithms of the previous equation to get

-log [OH-] - log [H+] = 14

You know that -log [H+] is pH.

Therefore, pH = 14 - (-log [OH-])

You can see from this equation that the higher than concentration of OH- ions, the lower the value of -log [OH-]. If the concentration of OH- ions reaches 1 mol/dm3 , the value of -log [OH-] is zero, which, according to the equation, gives pH=14.0.

However, if the concentration of OH- ions exceeds 1 mol/dm3 (which is very rare), the value of -log [OH-] would be negative, which, according to the equation, gives a pH of greater than 14.0.

Therefore, the pH range does not necessarily have a maximum of 14.0, since there is no limit to the concentration of a base.

Answer 6

The Ph scale is just a scale so it has to stop somewhere. For instance the temperature is measured in degrees and it only goes down to -273. Its just a scale, it has to finish somewhere.

Answer 7

pH is based on the ionic product of the water.

At ionic product of water reaches to 100, then the pH of the solution is 14.

Answer 8

Scale stops at 14, like you can't get a Category 6 hurricane.

Answer 9

This is only a convention.

Answer 10

A pH=14 is extremely basic.