1- What is the equivalence point of a titration? Give an appropriate definition. 2- How does the equivalence point of a titration differ from the end point? 3- What property of phenolphthalein makes it a useful indicator for acid-base titrations having equivalence points in the pH range of 7 to 9? 4- A certain concentrated HCl solution has a density of 1.27 g/mL and is 37.5 % HCI by mass. What is the molarity of this concentrated HCl solution? 5- How many mL of 0.10 M NaOH is used for the titration of 40 mL 0.20 M H2SO4?