Achemistry graduate student is given 250. ml of a 1.00 m trimethylamine cch, n solution. trimethylamine is a weak base with kb=7.4x 10 . what mass of (ch3)3nhbr should the student dissolve in the (ch3)3n solution to turn it into a buffer with ph-11.467 you may assume that the volume of the solution doesn't change when the (ch3) nhbr is dissolved in it. be sure your answer has a unit symbol, and round it to 2 significant digits.

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml