Question

what is the ph of a tris buffer solution made with 20.0 ml 0.313 m of the weak acid and 12.0 ml 0.297 m of naoh? pka of tris (i.e. tris(hydroxymethyl) aminomethane) is 8.072.

Answer 1

To calculate the pH of a tris buffer solution, you can use the Henderson-Hasselbalch equation.

Step-by-step explanation:

In order to calculate the pH of a buffer solution made with tris, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

Where pKa is the dissociation constant, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.

In this case, we have 20.0 ml of 0.313 M weak acid (trisHCl) and 12.0 ml of 0.297 M sodium hydroxide (NaOH). NaOH is a strong base that will react with the trisHCl to form water and tris. The moles of trisHCl and NaOH will determine the initial concentrations of weak acid and conjugate base respectively.

Given that the pKa of tris is 8.072, we can calculate the pH of the buffer solution using the Henderson-Hasselbalch equation.