Question: TRIS is a weak base. Compute pH of a solution containing .050 moles of TRIS and .020 moles of HCl in a total volume of 2L. pKb for TRIS is 5.92. Use RNH2 to represent TRIS. Equation: pH = pKa+ log ([conjugate base]/[acid]) Work: change equation for pOH: pH = 14-pOH pOH = pKb + log ([conjugate acid]/[base]) pOH = 5.02 + log (.010/.025) <---- I converted to mol/L for these values pOH = 5.52 pH = 8.48 Real Answer: 8.26 Can someone show me where I went wrong? Thanks!