IIT JEE , AIEEE Forum - Chemistry , Physical Chemistry - if concentration of a HCl is 10^(-8),what will be its pH

anku1992

if concentration of a HCl is 10^(-8),what will be its pH

aerostar_nitin

[H⁺] = 10^-8

P^H = - log[H⁺]

= 8

thus pH of HCl is 8

abhi77

aerostar where are your concepts how can the ph of hCl be greater than 7.These type of questions have a diff method to solve.
HCl ----> H+ + Cl-
10^-8 10^-8 10^-8
if H+ conc decreases from 10^-7 then we have to add 10^-7 to the given conc(here we will add 10^-7 to 10^-8)
[H+]=10^-8+10^-7
=10^-7(1.1)
pH=log(10^-7)(1.1)
=6.996(very less acidic.)
Hope you got the answer. do rate if useful.

deedee

yeah d second person is correct ...HCl is an acid so pH is<7 thus it cant b 8 as d first person guessed

here we also hav 2 consider d [H+] frm water ie 10^(-7) in addition to [H+] frm HCl

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