1. Explain what is meant by calibration of the pH meter and why its required for accurate pH measurements. (2pts) 2. When you dissolved the tris-base solid and measured the pH (prior to pH adjustment), was this prepared solution of tris-base a buffer? Why or why not? (2pts) 3. What was the purpose of adjusting the pH of the tris-base solution to 7.4? (1pts) 4. What, specifically, does addition of HCI do to the solution of tris-base as the pH is being adjusted? (2pts)