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P1 Prelab quiz: 1) A solution of dilute hydrochloric acid was analysed by titrating a 20 cm portion against 0.0750 M sodium hydroxide, where 41.65 cm of hydroxide were required for neutralisation using phenolphthalein as an indicator. Calculate the molarity of the HCI. 2) Calculate the pH of 0.0025 mol dm HCL. 3) Calculate the pH of 0.00017 mol dm NaOH. 4) Which indicator is the most suitable for a weak acid/strong base titration? pKIn (thymol blue (pKal) - 2.0 pKin (bromcresol green) = 4.6 pKIn (methyl orange) = 3.7 pKin (phenolphthalein) - 9.4 pKIn (indigo carmine) - 12.2 5) Calculate the pH of a buffer made by mixing 50 cm of 0.1 molar benzoic acid (pKa -4.202) and 200 cm of 0.125 molar sodium benzoate 16