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Grade This Exercise 4. How many grams of benzoic acid would you add to 30 mL of 0.38M sodium benzoate in order to prepare a buffer solution at pH=3.8? Ka of benzoic acid is 6.3E-5. Show your work: Show your work here Enter the correct numeric value to 2.0% precision. Express scientific notation like 4.29E-15 Enter your answer here g Grade This Exercise 5. When 340.0 mL of 0.6 M benzoic acid is titrated with 0.4 M NaOH, what is the pH of the solution after 50 mL of base has been added? The pka for benzoic acid is 4.19. Enter the correct numeric value to 2.0% precision. Express scientific notation like 4.29E-15 Grade This Exercise 6. When 20 mL of 0.295 M sulfuric acid is titrated with a standard solution of 0.238 M NaOH solution, what volume of base is required to reach the second equivalence point of the titration? Enter the correct numeric value to 2.0% precision. Express scientific notation like 4.29E-15 mL Grade This Exercise 7. If equal volumes of 0.24 M acetic acid and 0.19 M sodium hydroxide are mixed, what is the pH of the resulting solution? The pka of acetic acid is 4.75 Enter the correct numeric value to 2.0% precision. Express scientific notation like 4.29E-15