Which acid has the pH value of 1?

Answer 1

AnswerpH=1 --> [HCl] = 0.10 mol/L , and this is why:

By definition [H+] = 10-pH or pH = -log [H+]

So at pH = 1.0 level the [H+] concentration is [H+] = 10-pH = 10-1.0 = 0.10 mol/L

1. If the acid is a strong, monoprotic acid like HCl and HNO3 then the acid concentration equals the [H+] = 0.10 mol/L HCl
2. If the acid is a strong but diprotic acid like H2SO4 then the acid concentration equals half of [H+] , so acid conc. = 0.050 mol/L H2SO4