Unit 6: Acid-Base Applications Lesson 1: Acid-Base Titrations

Example 1: Finding Unknown Concentration In the reaction H2SO4 + 2 NaOH → Na2SO4 + 2 H2O , an equivalence point occurs when 23.10 mL of 0.2055 M NaOH is added to a 25.00 mL portion of H2SO4. What is the [H2SO4]? 10 min

Example 2: Finding Extent of Neutralization An equivalence point is reached by reacting 25.00 mL of 0.1255 M NaOH with 38.74 mL of 0.02700 M H4P2O7. How many protons are removed from the H4P2O7 on the average and what is the balanced equation for the reaction? 10 min

Brain Break! Find as many words as you can using the letters shown, always using the middle letter. What’s the 9-letter word? ambulance

Example 3: Finding Purity of a Sample A 3.4786 g sample of impure NaHSO4 is diluted to 250.0 mL. A 25.00 mL sample of the solution is titrated with 26.77 mL of 0.09974 M NaOH. What is the percentage purity of the NaHSO4? 10 min

Example 4: Finding Molar Mass A 3.2357 g sample of unknown monoprotic acid is diluted to 250.0 mL. A 25.00 mL sample of the acid solution is titrated with 16.94 mL of 0.1208 M KOH. What is the molar mass of the acid? 10 min

Practice: Pg. 158 #94, 96, 98, 100, and 101 15 min