Ask Question
25 July, 06:20

A buffer contains 0.010 mol of lactic acid (pka = 3.86) and 0.050 mol sodium lactate per liter of aqueous solution.

a. Calculate the ph of this buffer.

+1
Answers (1)
  1. 25 July, 06:47
    0
    The given buffer solution contains lactic acid and sodium lactate

    i. e. CH3CH (OH) COOH/CH3CH (OH) COONa

    Lactic acid is therefore a monoprotic acid with pKa = 3.86

    Concentration of Lactic acid = 0.010 mol/L = 0.010 M

    Concentration of sodium lactate = 0.050 mol/L = 0.050 M

    Based on Henderson-Hasselbalch equation, the pH of the buffer is given as:

    pH = pKa + log[salt]/[acid]

    pH = pKa + log [CH3CH (OH) COONa]/[CH3CH (OH) COOH]

    pH = 3.86 + log[0.050/0.010] = 4.56
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “A buffer contains 0.010 mol of lactic acid (pka = 3.86) and 0.050 mol sodium lactate per liter of aqueous solution. a. Calculate the ph of ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers