RAW DATA AND OBSERVATIONS PART 1 STANDARDIZATION OF A SOLUTION OF SODIUM HYDROXIDE Concentration of HCl used: Volume of
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RAW DATA AND OBSERVATIONS PART 1 STANDARDIZATION OF A SOLUTION OF SODIUM HYDROXIDE Concentration of HCl used: Volume of HCl used: Indicator: Endpoint colour change: Final burette reading / mL Initial burette reading/mL Volume of NaOH used / mL Average of the three closest values: (within 0.10 mL) Phenolphthalein pale pink Table 1: Volume of Sodium Hydroxide Required for each Titration (4 marks) Trial 1 ᏢᎪᎡᎢ 2 Sample Code for unknown acid 0.1034 25.00 Trial 2 2.82 25.82 25.85 Sample bottle + unknown (initial) Sample bottle + unknown (1st sample removed) Sample bottle + unknown (2nd sample removed) (g) Sample bottle + unknown (3rd sample removed) mol L-1 (0.5 marks) mL Table 2: Weighing of Solid Acid Samples (Analytical Balance) (3.5 marks) Mass (0.5 marks) Trial 3 Trial 4* DETERMINING THE MOLAR MASS OF AN UNKNOWN SOLID ACID F (0.5 marks) (0.5 marks) Mass of Sample Only 0.3856 (1) 0.348 (2) 0.4286 (3)
Titration of the solid acid samples with standardized NaOH(aq) Concentration of NaOH used: Indicator: Endpoint colour change: Table 3 Volume of NaOH Required (3 marks) Sample 2 Final burette reading / mL Initial burette reading / mL Volume used / mL Sample 1 19.6 Pale pink INSTRUCTOR'S INITIALS and DATE: 17.44 mol L-¹ (0.5 marks) (0.5 marks) 21.54 (0.5 marks) Sample 3
Chemistry 1051 Laboratory CALCULATIONS FOR PART 2 Assume that all the solid acids used in this experiment are such that 1 mole of the acid, represented by "HX", reacts with 1 mole of NaOH, according to: Experiment 7 - Quantitative Titration HX(s) + NaOH(aq) → NaX(aq) + H₂O(1) 4. Treating each trial separately, calculate the number of moles of NaOH used in each titration (3 marks). Trial 1 (show in detail): Trial 2: Trial 3: 5. From the equation determine the number of moles of solid acid that must have reacted in each titration (3 marks). Trial 1 (show in detail): Trial 2: Trial 3: 6. Knowing the mass of acid used calculate its molar mass in grams per mole. Average the two closest molar masses you have obtained from the trials. (4 marks) Trial 1 (show in detail): Trial 2: Trial 3: