4. Benzoic acid is a weak monoprotic acid (Ka = 6.3 x 10-5). Calculate the pH of the solution at the equivalence point when 25.0 mL of a 0.100 M solution of benzoic acid is titrated against 0.050 M sodium hydroxide. 5. When 50.0mL of 0.100M nitric acid is titrated with 0.050M NaOH: A. Calculate the initial pH of the solution. B. Calculate the pH after 95.0mL NaOH is added. 6. Calculate the pH of the solution formed by adding 10.0mL of 0.050M NaOH to 40.0mL of 0.250M benzoic acid (Ka= 6.3x10-5). Additional pH Calculations 1. strong acid solution determine [H+], calculate pH – Calculate the pH of 0.00125M HNO3 2. strong base solution determine [OH-], calculate pOH, calculate pH – Calculate the pH of 0.00125M KOH 3. weak acid solution determine [H+] using ICE box, calculate pH – Calculate the pH of 0.00125M HOCl Ka = 3.5 x 10-8 4. weak base solution determine [OH-] using ICE box, calculate pOH, calculate pH – Calculate the pH of 0.00125M NH3 Kb = 1.8 x 10-5 5. salt of a weak acid write hydrolysis, calc Kb, determine [OH-] using ICE box, calc pOH, calc pH – Calculate the pH of 0.00125M NaOCl 6. salt of a weak base write hydrolysis, calc Ka, determine [H+] using ICE box, calc pH – Calculate the pH of 0.00125M NH4Cl 7. diprotic acid solution assume all [H+] from first ionization, determine [H+] using ICE box, – calculate pH Calculate the pH of 0.00125M H2CO3 Ka1 = 4.2 x 10-7 Ka2 = 4.8 x 10-11
4. Benzoic acid is a weak monoprotic acid (Ka = 6.3 x 10-5). Calculate the pH of the solution at the equivalence point when 25.0 mL of a 0.100 M solution of benzoic acid is titrated against 0.050 M sodium hydroxide. 5. When 50.0mL of 0.100M nitric acid is titrated with 0.050M NaOH: A. Calculate the initial pH of the solution. B. Calculate the pH after 95.0mL NaOH is added. 6. Calculate the pH of the solution formed by adding 10.0mL of 0.050M NaOH to 40.0mL of 0.250M benzoic acid (Ka= 6.3x10-5). Additional pH Calculations 1. strong acid solution – determine [H+], calculate pH Calculate the pH of 0.00125M HNO3 2. strong base solution – determine [OH-], calculate pOH, calculate pH Calculate the pH of 0.00125M KOH 3. weak acid solution – determine [H+] using ICE box, calculate pH Calculate the pH of 0.00125M HOCl Ka = 3.5 x 10-8 4. weak base solution – determine [OH-] using ICE box, calculate pOH, calculate pH Calculate the pH of 0.00125M NH3 Kb = 1.8 x 10-5 5. salt of a weak acid – write hydrolysis, calc Kb, determine [OH-] using ICE box, calc pOH, calc pH Calculate the pH of 0.00125M NaOCl 6. salt of a weak base – write hydrolysis, calc Ka, determine [H+] using ICE box, calc pH Calculate the pH of 0.00125M NH4Cl 7. diprotic acid solution – assume all [H+] from first ionization, determine [H+] using ICE box, calculate pH Calculate the pH of 0.00125M H2CO3 Ka1 = 4.2 x 10-7 Ka2 = 4.8 x 10-11
unit_8b_acid_base_class_packet.docx