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Χριστίνα
Χριστίνα asked in Science & MathematicsChemistry · 2 months ago

Calculate how many moles of hydrochloric acid are to be added to 2 liters of pure H2O so that the pH becomes equal to 2.0 ?

Calculate how many moles of hydrochloric acid are to be added to 2 liters of pure H2O so that the pH becomes equal to 2.0 

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  • Dr W
    Lv 7
    2 months ago
    Favorite Answer

    pH = -log[H+]

    [H+] =10^(-pH) = 10^(-2.0) = 0.01 M

    2 L * (0.01mol H+ / L) * (1 mol HCl / 1 mol H+) = 0.02 mol HCl

  • jacob s
    Lv 7
    2 months ago

    molarity of HCl = no of moles/volume in L

                            = moles/2L

    molarity of HCl = x/2 M

           HCl --------> H+ + Cl-

          moles/2 M     moles/2 M

         [H+] = [HCl]

         [H+] = moles/2  M

         2 = -log[moles/2]

                        moles = 0.02 

                  0.02 moles of hydrochloric acid are to be added to 2 liters of pure H2O so that the pH becomes equal to 2.0

                

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