24.6 gm sodium acetate dissolve in 300 ml of water adjust to pH 3.6 with glacial acetic acid and dilute to 1000 ml with water. if necessary, readjust to pH 3.6 glacial acetic acid or anhydrous sodium acetate as required, before use.
Dear Marah Al Taher,
Dissolve 24.61 g sodium acetate and 0.0452 g anhydrous acetic acid in 1 L of deionised water. Adjust pH using HCl or NaOH.
The pKa of acetic acid is 4.75, from what we can only expect fair pH buffering effect between approx. 3.75 to 5.75. The pH of acetic acid / sodium acetate buffer solutions can be simply calculated based on the Henderson-Hasselbalch equation, after the molar concentrations of acetic acid (Ca) and sodium acetate salt (Cs) at the buffer solution: pH = pKa + log10(Cs/Ca); what can be generally expected to hold for Ca > 100Ka. A possible derivation for this equation, along with a justification for the stated minimum concentration limit for its validity, can be found elsewhere at this forum: https://www.researchgate.net/post/pH_calculation_of_a_mixture_of_formic_acid_NaOH_and_water
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