Part 1: pH, POH, [H*], [OH-] and K,'s (Show all your work!) 1) Given one value, determine the other 3 (from above), with the proper # of sig. fig.s: a. pH = 10.2339 b. pOH = 11.997 c. [OH-] = 7.227 x 10-4 d. [H'] = 4.58 x 10-3 2) a. What is the pH of a 0.355 L solution containing 6.41 g of NaH,PO ? b. What would the final pH be if 8.08 g of Na HPO4 is added? c. To this original solution, what would the pH and [PO, -] be if 4.00 g of NaOH were added? Hint: determine moles of each, then concentrations, then pH. (PK,s = 2.142, 7.22, 12.371) 3) Arsenic acid has 3 pK,'s: 2.19, 6.94, and 11.51. Determine the concentrations of all the species (H2ASO, ASO3) at pH 7.00. Would this be a good buffer at this pH? Explain. 4) For a 0.500 M solution of HOAc at pH 4.757, how much KOH (in g) needs to be added to get to pH 5.136