Part 1. Amphoteric species Amphoteric species are able to act as both an acid and a base. For solutions 1-3, each compou

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Part 1 Amphoteric Species Amphoteric Species Are Able To Act As Both An Acid And A Base For Solutions 1 3 Each Compou 1 (62.01 KiB) Viewed 21 times

Part 1. Amphoteric species Amphoteric species are able to act as both an acid and a base. For solutions 1-3, each compound breaks into ions, one of which can donate and accept a hydrogen ion. Soln #1 Soln #2 Soln #3 Before making any measurements, calibrate your pH meter using the standard solutions provided. Be sure to transfer the standard solution into a clean dry flask to carry out the calibration. 0.10 M NaHSO4 0.10 M NaHCO3 0.10 M Na₂HPO4 Procedure 1. Pour -20mL of solution into a small beaker. 2. Measure the pH of each solution. Analysis 1. Identify the major species present. 2. Based on the measured pH, identify the solution as a strong/weak acid/base. 3. Use equilibrium constants in the table below to identify/calculate the K₂ and Ko of each amphoteric species. 4. Based on the values, are the measured pH values consistent with the theoretical values of K, and K? Substance H₂SO4 H₂CO3 H₂PO4 K₂1 Strong acid 4.3 x 107 7.5 x 10-3 750l₁ #1 PH = 1.50 Soln Soln #2 |PH=9.57 Soln #3 PH=8.38 K₂27 0.012 5.6 x 10-¹1 6.2 x 108 K₂3 N/A N/A 4.2 x 10-13