Acid-base Titration Calculations: A summary of the past 2 days … 1. ID whether the acid and base are strong or weak 2. Write the net ionic equation 3. Solve for moles, do stoichiometry, find the LR 4. Let the stoichiometry tell you what to do … a. If both strong: pH = -log[H3O+] or pOH = -log[OH-] b. If buffer: pH = pKa + log(A-/HA) c. If equivalence point: ICE Tables and K expressions

Phenol, C6H5OH, is a weak acid. Suppose 0 Phenol, C6H5OH, is a weak acid. Suppose 0.515 g of the compound dissolved in exactly 125 mL of water. The resulting solution is titrated with 0.123 M NaOH. What is pH at the equivalence point? (molar mass of phenol = 94.11 g, Kb for conj. base of phenol = 7.7x10-5) 11.2

Phenol, C6H5OH, is a weak acid. Suppose 0 Phenol, C6H5OH, is a weak acid. Suppose 0.515 g of the compound dissolved in exactly 125 mL of water. The resulting solution is titrated with 0.123 M NaOH. What is pH at the equivalence point? (molar mass of phenol = 94.11 g, Kb for conj. base of phenol = 7.7x10-5) 11.2

1. 50 mL of chloric acid, HClO3, is titrated to the equivalence point with 45.1 mL of 0.56 M potassium hydroxide. What was the concentration of the acid? What was the pH of the solution at the equivalence point?

2. A 10 mL sample of 0. 20 M hydrofluoric acid is reacted with 5 2. A 10 mL sample of 0.20 M hydrofluoric acid is reacted with 5.2 mL of 0.25 M sodium hydroxide. Has the equivalence point been reached? What is the pH at this point in the reaction? (Ka of HF = 7.2x10-4)

3. What is the pH of the solution at the equivalence point in the titration of 100. mL of 0.100 M NH3 with 0.100 M HCl? (Kb of NH3 = 1.8x10-5)

3. What is the pH of the solution at the equivalence point in the titration of 100. mL of 0.100 M NH3 with 0.100 M HCl? (Kb of NH3 = 1.8x10-5)

4. What volume of 0.35 M calcium hydroxide, Ca(OH)2, is required to reach the equivalence point when titrating 100 mL of 0.267 M hydrobromic acid, HBr? Hint: Be careful of the balancing, Ca(OH)2 has 2 OH- ions!

Follow the QR code on the handout to watch a video that explains the complete answer to problem #5

Acids and Bases