What is the pH of a solution prepared by dissolving 7.0 g of tris (FM 121.14) plus 12.0 g of tris hydrochloride (FM 157.60) in 250 mL water

Explanation:

Hello,

In this case, considering that TRIS is a weak base and the TRIS hydrochloride its conjugate acid with a pKa of about 8.08, we can use the Henderson-Hasselbach equation in order to compute the pH of the described solution:

Next, we compute the concentrations of TRIS and TRIS hydrochloride as shown below (mol/L):

Then, the pH:

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