Round STA Hd the weak acid? If [conjugate base] > [weak acid], how is pH base]. ne HA reacts with the OH- to form A. id (HA) is decreased, and the amount of Analogously, adding HCl to the buff- pre of the acid (HA) by reacting with the can we claim that a buffered solution pH of the solution?" How would you is friend? value of related to pKa? 13. A best buffer has about equal quantities of weak acid and con- jugate base present as well as having a large concentration of each species present. Explain. 14. Consider the following pH curves for 100.0 mL of two differ- ent acids with the same initial concentration each titrated by ons of acetic acid and sodium hydrox- ered solution. Explain. How does the n added change the effectiveness of the 0.10 M NaOH. one for the titration of a weak acid with or a strong acid with a strong base. How are they different? Account for the simi- ices. he titration of a weak acid (HA) with a ist the major species, and explain how lculating the pH of the solution at vari- che halfway point and the equivalence the weak acid HA and add some HCl to Vol NaOH species in the solution? What do you alate the pH of the solution, and how prmation? How does the pH of the solu- a. Which plot represents a pH curve of a weak acid, and which plot is for a strong acid? How can you tell? Cite three differences between the plots that help you decide. ompare with that of the final mixture? b. In both cases the pH is relatively constant before the pH changes greatly. Does this mean that at some point in each titration each solution was a buffered solution? the weak acid HA and add some of the are the major species in the solution? now to calculate the pH of the solution, e this information? How does the pH of e HA compare with that of the final c. True or false? The equivalence point volume for each titration is the same. Explain your answer. d. True or false? The pH at the equivalence point for each titration is the same. Explain your answer. 7.0 buffer, how would you nents to make up this buffer? Reference A5.3 in Appendix 5 of this text. From e best combination of components to are a pH arves for a diprotic acid titrated by a otic acid titrated by a strong base. List ent at various points in each curve. In alfway points to equivalence. How do I these halfway points?