Question

The buffer solution is made of 50ml of 1.0M CH3COOH and 50ml of 1.0M NaCH3COO.

Please find the expected pH of the buffer after the addition of the strong base, and the percent error between the expected pH and the measured pH of the solution.

pH of Buffer after the addition of the Strong Base: ix. Measure out 50.0 mL the buffer in part D and 2.0 mL of 1.0 M NaOH into a clean beaker. X. Rinse the pH probe with DI H2O and place it into the solution in the beaker ensuring that the tip is completely immersed. xi. After the pH value on the display has stabilized, record this value on the provided data sheet. xii. Remove the pH probe, rinse it, and place it in the waste beaker until you need it again to ensure that the electrode remains hydrated. xiii. Empty the solution and the remaining buffer solution from Part D into the waste beaker

Answer 1

50 me x l.om 0.5 m Solution: concentration of CH₂ cooh in final solution 50 m x HOM 0,5M Concentration of CH₂ Coona in final solution 250 ml XI.OM O 0,5 M loro me loome Pra of ehlscorolt = 4,8 According to Henderson-Handbalch pH = pka + log (A 4.8 + log to 2 4.8 After addition of Nadt: et₂ coold + at • Ź CH₂ Cope + ho 2 me 1.om Naoh in loome in ? 2 mixlom loom -0.02M

... Now [etty cou-] - (0.540,02)M = 0.52M [ets coolt]> (0.5 -0.02)M = 0.98M Now pt pha + 10 g 1 A $48+ log 2. 53 9835 - expected blt4,835 Measured pit, 4.60 percentage evrer = 4.835-4.60x100%. 9.835 4.86% Posible reason for error: Incomplete neutralisation