a chemistry graduate student is given 300. ml of a 0.40 m ammonia (nh3) solution. ammonia is a weak base with k. = 1.8 x 10^-5. what mass of nh4cl should the student dissolve in the nh3 solution to turn it into a buffer with ph = 8.88?
you may assume that the volume of the solution doesn't change when the nh4cl is dissolved in it. be sure your answer has a unit symbol, and round it to 2
significant digits.