Introduction Safety water if they come in contact with your skin. We recommend t

Question

Introduction Safety water if they come in contact with your skin. We recommend that you wear gloves. The acids and bases used in this experiment can be hazardous. Rinse with plenty of Follow the instructor's directions for proper disposal of waste. Amphoteric species The following solutions will be investigated Soln #1 Soln #2 Soln #3 | 0.10 M NaHS04 | 0.10 NaHCO3 | 0.10 M Na2HPO4 2. Identify each species as a strong/weak acid/base. 3. Identify the major species present. 4. Based on the equilibrium constants in the table below, calculate the K, and K, of each amphoteric species. Based on the calculated values, identify whether each amphoteric species will theoretically act as an acid or a base in aqueous solution. K82 0.012 Substance H2SO4 ????, H3PO4 Strong acid 4.3 x 10 7.5 x 10 N/A N/A 5.6 x 10 x10" | 4.2x10" 8-2

Explanation / Answer

Solutions

0.1 M NaHSO4

2. weak base HSO4-

3. major species HSO4- and Na+

4. hydrolyze to give OH- in solution, so aqueous solution of NaHSO4 is basic in nature

HSO4- + H2O <==> H2SO4 + OH-

Kb = Kw/Ka = 1 x 10^-14/0.012 = 8.33 x 10^-13

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0.1 M NaHCO3

2. weak base HCO3-

3. major species HCO3- and Na+

4. hydrolyze to give OH- in solution, so aqueous solution of NaHCO3 is basic in nature

HCO3- + H2O <==> H2CO3 + OH-

Kb = Kw/Ka1 = 1 x 10^-14/4.3 x 10^-7 = 2.32 x 10^-8

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0.1 M Na2HPO4

2. weak base HPO4^2-

3. major species HPO4^2- and Na+

4. hydrolyze to give OH- in solution, so aqueous solution of Na2HPO4 is basic in nature

HPO4^2- + H2O <==> H2PO4^- + OH-

Kb = Kw/Ka2 = 1 x 10^-14/6.2 x 10^-8 = 1.61 x 10^-7

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