Question
3a) A chemistry graduate student is given 100.mL of a 1.00M acetic acid (HCH3CO2) solution. Acetic acid is a weak acid with =Ka1.810^5. What mass
3a) A chemistry graduate student is given 100.mL of a 1.00M acetic acid (HCH3CO2) solution. Acetic acid is a weak acid with =Ka1.810^5. What mass of NaCH3CO2 should the student dissolve in the HCH3CO2 solution to turn it into a buffer with pH =4.63? You may assume that the volume of the solution doesn't change when the NaCH3CO2 is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.
3b) A chemist titrates 50.0mL of a 0.4242M pyridine (C5H5N) solution with 0.8710M HBr solution at 25C. Calculate the pH at equivalence. The pKb of pyridine is 8.77
Round your answer to 2 decimal places .Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of HBr solution added.
pH=__________
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Chemistry
Authors: John McMurry, Robert C. Fay, Ph.D. Dillon, Stephanie
5th Edition
136128890, 978-0136128892
