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# Wksht08 - (b BTB is so pH 5 A Weak Base Problem For 0.0050...

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CHM 2046/Myers Class Worksheet 8 January 22, 2010 Acids and Bases – Calculations 1. Understanding pH 2. The Approximate Method: For 0.20 M HCN (Ka = 4.0 x 10 -10 ) what are the equilibrium […] values and the pH? [HCN] = __________ [CN - ] = [H 3 O + ] = ___________ pH = ____ Would the approximate method work for HClO 2 (Worksheet 7, Problem 5)? ________ How would you know, in advance? 3. The Weak Acid Shortcut: 4. The pH of Water. We shall test pH using bromthymol blue indicator . This changes color as: pH < 7.1 color is __________, pH > 7.1 color is ___________, pH F 7.1 is _________ (a) _______________, BTB is _____________ so pH _________________

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Unformatted text preview: (b)_______________, BTB is _____________ so pH _________________ 5. A Weak Base Problem: For 0.0050 M CH 3 NH 2 (Kb = 4.4 x 10-4 ) what are the values of […] and pH? [CH 3 NH 2 ] = ____________ [CH 3 NH 3 + ] = ____________ [OH-] = _____________ pH = _________ 6. The Weak Base Shortcut: What are the […] and pH for 0.2 M NaCN? (for CN-, Kb = 1.6 x 10-5 ) [CN-] = ___________ [HCN] = [OH-] = ___________ pH = ____ 7. The Relationship of Ka to Kb for a CA/CB Pair. 8. What is Kb for HPO 4-2 (based on Ka values in the A/B Handout)? Kb = _____________...
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Wksht08 - (b BTB is so pH 5 A Weak Base Problem For 0.0050...

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