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

FREE Expert Solution

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

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Weak Acids concept. If you need more Weak Acids practice, you can also practice Weak Acids practice problems.