Question

a buffer is prepared by mixing 0.052 mol of tris with 0.020 mol of hclo4 in a volume of 1.83 l. compute the ph of the solution. (report ph to two decimal places.)

Answer 1

To calculate the pH of the buffer solution, use the Henderson-Hasselbalch equation. The pH is approximately 8.51.

Step-by-step explanation:

To calculate the pH of the buffer solution, we can use the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). In this case, the pKa of tris is 8.1. We can calculate the concentrations of tris and trisHCl by dividing the moles of each by the total volume of the solution:

1. [A-] = (0.052 mol) / (1.83 L) = 0.028 mol/L
2. [HA] = (0.020 mol) / (1.83 L) = 0.011 mol/L

Plugging these values into the Henderson-Hasselbalch equation, we get:

pH = 8.1 + log(0.028/0.011) = 8.1 + log(2.545) = 8.1 + 0.406 = 8.51

Therefore, the pH of the solution is approximately 8.51.