Graded Assignment Unit Test, Part 2 Answer the questions below. You may use a scientific calculator for this test. When you have finished, submit this assignment to your teacher by the due date for full credit. 1. A chemist performs a titration to determine the concentration of a KOH solution. She places 24.0 mL of the solution into a flask and titrates it with 0.011 M HCI solution. A neutral endpoint once 14.6 mL of acid is added. Assuming the acid and base react completely, what is the initial concentration of the base? You must show all work for full credit. 2. Complete the calculations to fill in the table below. For full credit, you must show all calculations beneath the table. Substance Hydronium lon Concentration H+ Hydroxide lon Concentration OH- Ph Value Solution A Solution B Solution C 1.2 x 10-4 M 3.4 x 10-8 M 2.5 x 10-8 M Acid or Base? 3. A student is investigating the properties of an unknown acid, HA, and its dissociation in water. The student prepares a 0.1 M solution of HA and finds that the concentrations of H+ and A- ions in the solution to each be 1.5×10-2 M. What is the Ka for this substance? Be sure to show all steps of the calculation for full credit. 4. Calculate the volume of 0.550 M HCI solution needed to completely react with 25 mL of 1.30 x 10-2 M NaOH. Show all steps of the calculations.