Question

QUESTION 8 4 points Stu and Doc test the base buffer capacity of their buffer. Help them with their base buffer capacity calculations. Here is the data for the base capacity experiment: 25.0 mL of acetic acid - acetate buffer, measured with a pipet Initial pH = 4.57 12.65 mL of 0.0300 M NaOH added, measured using a buret Final pH = 5.24 Calculate the moles of NaOH added to the buffer. (Answer in decimal format with 3 significant figures and units of mol) Calculate the base buffer capacity of the buffer using moles of NaOH per liter of buffer. (Answer in decimal format with 3 significant figures and units of mol/L)

Answer 1

(a) Moles of NaOH added to the buffer = moles = Molarity x Volume = 0.03 x 12-65 moles 1000 Moles of NaOH = 3,795 x 10-4 moles (b) Bose beeffer capacity [y] = number of moles of SB added per btre buffer • Change in pH 3.795x1074 x 1000 25 = 0.02265 mole/L 5.24 - 4.57

(a) Moles of NaOH added = 3.80 x 10^-4 moles

(b) Base buffer capacity = 2.27 x 10^-2 mole/L