(b) Calculate the pH of 50mLHCl0.20M solution and its new pH after that solution was diluted 4 times. (3 marks) (c) A 50mL acetic acid 0.1000M was titrated against NaOH0.1000M. Calculate the pH of the titration mixture after the addition of 20mLNaOH. (KaCH3COOH=1.76105) (5 marks) (d) Discuss why the pH range of 7-10 is more suitable for the determination of chloride ion by using Mohr method. (4 marks)