A Solution Prepared with Propanoic Acid and Sodium Propanoate: Calculating pH
What is the pH of a solution prepared at 25∘C that contains 0.084M propanoic acid (HC2H5CO2) and 0.50M sodium propanoate (NaC2H5CO2) with a Ka value of 1.3×10^−5?
The pH of the buffer solution consisting of propanoic acid and sodium propanoate can be calculated using the Henderson-Hasselbalch equation. By inserting the given values into the equation, the pH is determined to be 5.665, indicating a slightly acidic buffer solution.
Calculating pH using Henderson-Hasselbalch Equation
Sodium Propanoate (NaC2H5CO2) Concentration: 0.50M
pKa Value: 4.89 (calculated from Ka = 1.3 x 10^-5)
To calculate the pH of the solution containing propanoic acid and its conjugate base, sodium propanoate, we can use the Henderson-Hasselbalch equation:
What is the initial pH of a solution prepared with propanoic acid and sodium propanoate using the ICE approach?
The initial pH of a solution prepared with propanoic acid and sodium propanoate is approximately 2.87 using the ICE approach.
Calculating Initial pH using ICE Approach
Propanoic Acid (HC2H5CO2) Concentration: 0.084MKa Value: 1.3 x 10^-5
To calculate the initial pH of the solution, we can use the ICE approach and the given values of the acid concentration and Ka:
[H3O+] = Ka × [CH3CO2H] = √(1.3 × 10^-5 × 0.084) = 2.87 × 10^-3 Therefore, the initial pH of the solution prepared with propanoic acid and sodium propanoate is approximately 2.87.