Tris is a monoprotic weak base with pKb = 5.93 at 25 degrees celsius.
A. Calculate the moles of Tris and moles of TrishH+ that are present in a 500 ml 0.1 M Tris-TrishH+ buffer soln with pH 7.90 at 25 degrees celsius
B. Given that the only available reagents are 1) solid TrisHCl (FW: 157.60) and 2) stock 6 M NaOH soln, calculate the mass of the solid and volume of solution required to prepare the buffer described in A.
C. A 100 mL portion of the buffer in 3A was then obtained. the pH of this 100 mL portion is to be adjusted to 7.40. Given that the only available reagents are 1) 2 M HCl soln and 2) 2 M NaOH soln, which should be used to adjust the desired pH?
D. Calculate the volume in mL of the chosen reagent in 3C needed to bring about the desired change in pH