What part of the titration curve of a weak acid corresponds to the buffer region? Explain.2.Why is the end point of a titration of weak acidand potassium hydroxide somewhat basic?3. Consider 100 mL of 0.100M H3A. Assume that H3A is a Triprotic acid. Assume the H3A has pKa1= 4; pKa2 = 8; pKa3= 12You will titrate this acid with 0.100M NaOH. a) What volume of the NaOH must be added to maximize the concentration of H2A-?b) What volume of the NaOH must be added to maximize theconcentration of HA2-?c) What arethe pH of the solutionsin parts(a)and (b)?d) What is the pH of solution after only 30 mL of the NaOH have been added? What are the major species of H3A in this solution?e) What is the pH of the solution after 130 mL of NaOH have been added? What are the major species of H3A in this solution?f) What is the pH of the solution after 150 mL of NaOH have been added? What are the major species of H3A in this solution?g) What is the pH of the solution after 230 mL of NaOH have been added? What are the major species of H3A in this solution?h) What is the pH of the solution after 300 mL of NaOH have been added? What are the major species of H3A in this solution?