Question

CHEMISTRY 2A Name Experiment 12, pH, Acid-Base Equilibria, Buffers Report Sheet PART 1. Measuring pH Solution [H] (OH) PH Arrange in order of decreasing (H) EC 0.1 M H3PO4 0.99 0.1 M NH OH V 0.1 M NaHSO4 0.1 M NaOH 6.82 0.1 M NaH2PO4 (Most acidic on top, least acidic on the bottom.) Касі 0.1 M HC2H302 PART 2. Shifting of an Equilibrium and Le Chatelier's Principle A. Write the HC2H302 / C2H302 equilibrium equation:

Answer 1

First find Cht] from the relation between pH & CHI] pH = -log, [ht] [H+] . 10-PH Then Lind cont] from the equation [OH-] = 1 x 10-the Сн+) [OH-] = solution 0.1M H₃PO4 pH 0.99 [A+] = 10-PH [ht] = 10-ph 1x10-14 Сн+) 210-0.99 Cor ] =1x10-14 21.02x10 1.02x10 9.8x10-14 10.1M NHGOH 11.80 [ht] = 10 11.80 [OH-] = 1x10-14 1.58x10-12 6.3 * 10 3 - 1.58x10-12 0.1M Naltsou 0-88 CH* = lo-0-88 (OH-] = 1x10-14 1-31 *10 7.6 x 1014 =1.31 X10-1 6.82 0.1m NaOH CH+ ] = 10-6.82 COH-] = 1 x 10-14 1.5x10 z 115x107 z 6.6 *10-8 Arrangéng in decreasing order of CH4+] 10.1 M NaHSOL (CH) 1.31X10-9) 270.1 M H3 POLE (CH+J=1.02 X10') 3) 0.M a O CH+2 = 1.5* lo) 4) 0.1M Nahol (CH+] = 1.58x10-12)