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Why pH range is maximum 14.0
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As you all know ,we measure pH of all of samples in
water.And the reaction of water is
H<+ + OH<- ------> H20
In this equilibration constant kw is
[H+] [OH-] = Kw = 1 X 10-14
By applying -log on both sides
-log [OH-] - log [H+] = 14
You know pH= - log [H+]
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.
| Is This Answer Correct ? | 33 Yes | 2 No |
The maximum H+ ion concentration of the solution is 10-4
can be measurable below lower value is could not be able to
measure. Hence the maximum value of the pH is 14.
| Is This Answer Correct ? | 8 Yes | 7 No |
Answer / brahm aggarwal
pH stands for "power of the hydronium ion", or the exponent of ten representing the concentration of the H3O+ radical. It can't be less than 0, and it doesn't get more concentrated than 10^14. So a substance with pH5 has 10x the concentration (of that ion) than one with pH4.
| Is This Answer Correct ? | 1 Yes | 2 No |
Answer / manoj kumar
Ans no first is correct. And very clear and effective for a chemist as well as student.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / nishita
the ans is wrong coz... the question askd is why pH range is
maximum??? n nt wat is th pH range.. bt.. nywy the ans is
wrong..
so anybody who knws the ans plz... post it asap...
| Is This Answer Correct ? | 5 Yes | 13 No |
my name is santhosh i cmpleted b.pharmacy in 2009 then i went to uk in 2010 to pg diploma business management. after i came back to india.. recently again apply to uk for pharmaceutical analysis. they refused my visa you failed to explain y u r change subject. so plz ineed answer for y change the cource
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