How does the ratio of weak acid and its conjugate base concentrations affect buffer capacity? Which tube of solutions (molar concentrations of acid and base) is the best to maintain a near-constant pH?
What is the most effective pH range of the buffer based on its pKa value? Why?
How are different between the calculated and experimentally measured pH values of phosphate buffer solutions before and after adding 480 ul of 0.1 M NaOH solution?