A student does a titration to find the concentration of a solution of hydrochloric acid. The student titrates 25.00 cm3 of hydrochloric acid with sodium hydroxide solution of concentration 0.200 moles per dm3. The equation for the reaction is: HCl + NaOH --> NaCl + H2O The student added 28.60 cm3 of sodium hydroxide solution to neutralise the hydrochloric acid. Calculate the concentration of the hydrochloric acid.

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.