Question

Does anyone know What does pH= ?

Answer 1

Answer:  Yes.  The pH = 7.6   .
___________________________________________________
Explanation:
____________________________________________________


pH = - log [H⁺]   ; in which, by convention, we assume that there
                            is an implied "base 10" if there is no number listed as a
                            "base" under the "log" sign;

i.e. , " pH = - log [H⁺]⁺ = - log₍₁₀₎ [H⁺] ;
________________________________________________
in which, the:  " [H⁺] " refers to the concentration of hydrogen ions, or " H⁺ " ; in "Molarity" ; that is:  "moles of solutes per Liters of solution", or "mol / L", or "M" .
________________________________________________
Likewise, "pOH = - log [OH⁻] =  - log₍₁₀₎ [OH⁻] " .
________________________________________________
  Note:  pH  + pOH = 14 .
________________________________________________
So, given:  "A solution with 6.4 * 10⁻¹⁰ M  OH (in our problem), find the "pH".
_________________________________________________
   The pOH of the solution is 6.4 .
_________________________________________________
Since pH + pOH = 14 ; 
               we can substitute "6.4" for "pOH" ; and solve for "pH":
_________________________________________________
      pH + 6.4 = 14 ;

        Subtract "6.4" from each side of the equation; to isolate "pH" on one side of the equation; and to solve for the "pH" ;
_________________________________________________
      pH + 6.4 − 6.4 = 14 − 6.4 ;
_________________________________________________
      pH = 7.6   .
_________________________________________________

Answer 2

If i am not mistake u can use -log[concentration of oh-] to find it
ie -log[6.4*10^-10]=9.19