1. how many moles of KCN, are required to prepare 250.0mL of a solution with a pOH equal to 2.86

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter15: Acid-base Equilibria
Section: Chapter Questions
Problem 44E: Calculate the pH after 0.15 mole of solid NaOH is added to 1.00 L of each of the following...
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1. how many moles of KCN, are required to prepare 250.0mL of a solution with a pOH equal to 2.86

2. what is the pH of a 1.25 M solution of C2H5NH3I

3. what is the ph when 30.0 ml of 1.50 M propanoic acid, HC3H5O2, is titrated with 37.5 mL of 1.20 M NaOH

Please help me with these 3. 

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