Ask Question
7 April, 15:48

Which acid is the best choice to create a buffer with ph = 3.19?

+5
Answers (1)
  1. 7 April, 17:03
    0
    The best choice is hypochlorous acid nitrous acid (HNO2) because it has the nearest value of pK to the desired pH.

    pKa of nitrous acid is 3.34

    If we know pKa and pH values, we can calculate the required ratio of conjugate base (NO2⁻) to acid (HNO2) from the following equation:

    pH=pKa + log (conc. of base) / (conc. of acid)

    3.19=3.34 + log c (NO2⁻) / c (HNO2)

    3.19 - 3.34 = log c (NO2⁻) / c (HNO2)

    -0.15 = log c (NO2⁻) / c (HNO2)

    c (NO2⁻) / c (HNO2) = 10⁰¹⁵ = 1.41
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “Which acid is the best choice to create a buffer with ph = 3.19? ...” in 📘 Chemistry if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers