1. A sample of an aspirin tablet weighing 78.79 g was titrated with 56.39 mL of a standardized Ba(OH)2 solution with a concentration of 0.7406. Determine the % of acetylsalicylic acid present in the aspirin sample. 2 HC9H7O4 + Ba(OH)2 --> Ba(C9H7O4)2 + 2H2O acetylsalicylic acid = 180.158g/mol

6. Acid/base titration is a common method to determine the molarities of acids or bases, the molarity of certain salts can also be determined by titration. It took 22.34 mL of 0.5861 M HCl solution to neutralize 25.00 mL NaNO₂ solution. The acid- dissociation constant of HNO₂ is 4.511 × 10-¹. NaNO₂ + HCl → HNO₂ + NaCl Please answer the following questions. A What is pH of the NaNO₂ solution before titration? Hint, calculate the molarity of the NaNO₂ solution first. pH = Please provider your answer below. ( Check answer 7²² B. M HCl solution was added to the NaNO2 solution? pH = 00 0 Please provider your answer below. What is the pH when 12.78 mL of 0.5861 (0) Check answer C. What is the pH when 14.39 mL of 0.5861 M HCl solution was added to the NaNO₂ solution AFTER the equivalence point? pH = Please provider your answer below. 00 0 °C? pH= Please provider your answer below. Check answer What is the pH at equivalence point at 25 A → ← Check answer ← $ H $

2) 50.0 mL of an unknown monoprotic acid is titrated with 0.116 M NaOH, and it requires 44.3 mL of the base to reach the endpoint. What is the concentration of the unknown acid? A: 0.116 M B: 0.131 M C: 0.103 M D: 0.107 M   3) How many grams of carbon dioxide are produced from the combustion of 473 grams of octane?   A: 1460 g B: 928 g C: 2920 g D: 182 g

2) A 30.00 mL sample of an unknown H3PO4 solution is titrated with a 0.100 M Ba(OH)2 solution. The equivalence point is reached when 26.38 mL of Ba(OH)2 solution is added. What is the concentration of the unknown H3PO4 solution? 2 H3PO4 +3 Ba(OH)2 → Ba3(P04)2 + 6 H2O A) 0.264 M B) 0.0879 M C) 0.0586 M D) 0.176M DO 3-

The four solutions were made and then mixed in the following order. 1. Starting with 0.100M Bacl2 100.0 mL 2. Adding 0.100M AgNo3 50.0 mL 3. Adding 0.100M H2SO4 50.0 mL 4. Added 0.100M NH3 250.0 mL Write a response formula for the response that takes place after each step, assume that all the responses are complete and calculate the concentration of Ba2+, Cl-, NH3 and NH4+ in the final solution.