Calculate the pH of each of the solutions and the change in pH to 0.01 pH…

Calculate the pH of each of the solutions and the change in pH
to 0.01 pH units caused by adding 10.0 mL of 2.27-M HCl to 670. mL
of each of the following solutions. a) pH of water before mixing,
after mixing and pH change b) 0.152 M
C2H3O21- pH before
mixing, after mixing and pH change c) 0.152 M
HC2H3O2 ​pH before mixing, after
mixing and pH change. d) a buffer solution that is 0.152 M in each
C2H3O21- and
HC2H3O2 ​pH before mixing, after
mixing and pH change. PLEASE HELP!!! due in an hour and i am so
lost!!!