Problem: Determine the pH of each of the following two-component solutions.6.00×10−2 M in HI and 8.50×10−3 M in HF

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We are being asked to determine the pH of the following two-component solution


6.00 × 10−2 M in HI and 8.50 × 10−3 M in HF


Recall that the pH and pOH of a compound determine its acidity and basicity.


• pH

▪ pH stands for the negative logarithmic function of hydronium ion concentration
can be calculated using the following equation:


pH=-log H+

Take note that:         [H+] = [H3O+]


Remember that:


  • HI is a strong acid  completely dissociates in solution:
    • HI → H+ + I-
      • [HI] = [H+]
  • HF is a weak acid  → partially dissociates in solution:
    • HI ⇋ H+ + F-
      • [HF] > [H+]


This means that for this mixture, the pH will depend on the concentration of the strong acid, HI:

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Problem Details

Determine the pH of each of the following two-component solutions.

6.00×10−2 M in HI and 8.50×10−3 M in HF