please answer all of them using sig figs !! urgent thanks in advance of calcium propionate, a food preserva the of 0.698-1 sorun 2) The pH of a 0.10-M solution of caffeine is 11.70. Determine K, for caffeine from these data: CHNO2 (aq)+ H2O(l) = CH.N.O.H+ (aq) + OH(aq) How much solid NaCH.CO, 3H,0 must be added to 0.300 L of a 0.50-M acetic acid solution to give a 5.00? (Hint: Assume a negligible change in volume as the solid is added.) 5) A 1.0 L buffer contains 0.100 mol formic acid (HCOOH) and 0.500 mol of its salt sodium formate (HCOONa). K, for formic acid is 1.8 x 104. What will be the pH of the solution after addition of 0.02 mol NaOH was added to the buffer? (continue working through the next page)