If we want to preapre a physlogical buffer solution with pH about 7.40 at body temperature (37°C), what volume of 0.05 mol/L hydrochloride acid should be added to 100 mL of a buffer solution in which both of the concentration of Tris and Tris-HCl are 0.05 mol/L? and what is a the mass of NaCl solid should be added into the solution to prepare an isotonic solution compared with blood? pKa of Tris-HCl is 7.85 at 37 °C. Assume the effect of ionic stength is not considered.