A chemist titrates 130.0 mL of a 0.2136 M trimethylamine ((CH3N solution with 0.8361 M HNO3 solution at 25 °C. Calculate the pH at equivalence. The pKb of trimethylamine is 4.19.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of HNO3 solution added.

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Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.