Question

Part B, C

Part B

Please
<CHM 116 ASU West Chapter-17 Homework Problem 17.28 - Enhanced - with Feedback 20 of 29 Review Constants | Periodic Table A buffer contains 0.19 mol of propionic acid CH COOH) and 0.28 mol of sodium propionate (C2H5COONa) in 1.20 L. What is the pH of the buffer after the addition of 0.01 mol of NaOH? Express the pH to two decimal places. You may want to reference (Pages 721 - 729) Section 17.2 while completing this problem. 80 ADV O O ? pH = 4.92 Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part What is the pH of the buffer after the addition of 0.01 mol of HI? Express the pH to two decimal places. A MO ? pH = 4.71

Answer 1

part B) by adding Nach to aidie buffer solution, concentration of and decreases and concentration of salt increases. moles of and after NaOH addition & 0,19-0001 0.18 moles moles of salt after nach addition = 0.28+0001 0.29 modes pHepkalug ( Sale) = 4.87 +log ( 0022) 55.077 55108 part 2); by adding HI to accedie buffer solution, concesstration of and increases and salt decreases. moee of acid after HI addition = 0,19+0.01 0.20 moles noles of scelt after HI addition = 0.28-0.01 0.27 ndes pH = 4.87 +log C 0.27) = 5.022 = 5:02 part o): NH₂ + NHAd is a basic buffer solution. cą) (1) (ap) () ** He Nut o° - Kb = [NH] Cono INH ] by uring this equilibrium expression, we can determine the [OH®] concentralion.