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CHM152GW5,6 S09

Chemistry (MasteringChemistry Series)

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CHM 152 Group Work 5 & 6 Name: _____________________________ 1. Calculate the pH of a solution containing 0.285 moles of hypobromous acid (HBrO) and 0.315 moles of NaBrO in 2.50 liters of water. Given K a for HBrO is 7.8 x 10 -7 . Show your work below. a. 6.06 b. 6.11 c. 6.15 d. 7.01 e. 0.545 2. Give the formulas for two chemicals that would make a buffer solution in water. __________________ 3. Calculate the pH when 15.0 mL of 0.150M perchloric acid is added to 12.0 mL of 0.125M potassium hydroxide. Show your work, balanced reaction and IF table for full credit. pH = ______________
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4. How many milliliters of 0.35M lithium hydroxide must be added to 25.0 mL of 0.45M acetic acid to reach the equivalence point? What is the pH at the equivalence point? Given: K a for acetic acid is 1.8 x 10 -5 mL base = ____________ pH at eq. pt. = _________________ 5. a) Calculate the pH of a buffer system composed of 35.5 grams acetic acid and 32.4 grams lithium acetate in 2.00 liters of water. b) Calculate the pH if 5.50 grams nitric acid is added to a buffer system in part a. Note the small amount of nitric acid will not affect the volume of 2.00 liters. c) Explain the change, or lack of change, in pH after the addition of the nitric acid to the buffer system. Show all work.
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CHM152GW5,6 S09 - CHM 152 Group Work 5 6 Name 1 Calculate...

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