Question

1. While titrating, a student added 50 mL of NaOH solution without ever seeing a color change. Suggest at least two pos sible reasons that this might occur. 2. A student completed two trials of titration with a very faint pink color, and one that was a very bright, intense pink color. What should the student do at that point? 3. A student asserts that the AG calculated from K is not AG n since the reaction did not take place at 25 C. Consult your textbook. (See Chapter 18, relating AG to AGa at nonstandard states and to Kea). Decide whether the student was correct or not and explain your answer. 4. A student says that since AG" for dissolving the slightly soluble material is positive there cannot be any dissolving happen ing, since it is not a spon ta neo us reaction Discuss this, explaining whether or not the student is correct

Answer 1

Question 1.

(i) If 50 mL of NaOH solution is more than the needed, the titration is overdone, and the overall solution becomes too much basic.

(ii) If 50 mL of NaOH solution is less than the required, the titration doesn't reach the endpoint because it is incomplete.