Question

What mass of solid NaCH₃CO₂ should be added to 1.7 L of 0.5 M CH₃CO₂H to make a buffer with a pH of 5.34?

Answer 1

Acidic buffers are solutions that have a pH below 7 and contain a weak acid and one of its salts. For example, a mixture of acetic acid and sodium acetate acts as a buffer solution.
Formula for pH or acidic Buffer is - pH = pkat log [salt] • [acia] Pra-> -log ka, where Ka is the dissociation Constant for weak acid. [salt] – Concentration or sart or weat Acid (inco Na) [Acid] - concentration of weak Acid. (ch3 (24) - (cr₂ con pk for Acctic Acid is Generally = 4.76 pH= 5.34, So, 5:34-4.76 = log [salt] . 10 [acid 0.582 log [salt] [acid 3. 8- acid [acid]=0.5m = [cncon]

1.9m=[sait] 1.am- No of moles of chlo Na Volume of fixture solution Volume of solution=1.72 so, No of moles of CH Cona= 1.9817 = 3.23 moles Molar mass of sodium Acetatez 82 g/mol so, mass ned needed= 3.23882 g T= 264.86g 7