How to answer for Ka/ Kb and calculated pH of a solution?
I think solution 1,2 only has one Ka/Kb value then the other Sol. 3,4. Then with calculated pH, pH = -log[H+] (acid) and pH = 14 + log[OH-] (base) is utilized. Though I do not know how getting the Ka/Kb will be used to get pH
Ex.
Solution 1: 30.0 mL 0.10 M CH3COOH
Solution 2: 15.0 mL 0.20 M CH3COOH – 15.0 mL 0.20 M NaCH3COO
Solution 3: 30.0 mL 0.10 M NH3
Solution 4: 15.0 mL 0.20 M NH3 – 15.0 mL 0.20 M NH4Cl
Sol 1,2 used methyl orange as indicator
Sol 3,4 used phenolphthalein as indicator
| Solution w/ measured pH | Ka/Kb | Calculated pH |
|
1 a 1.0 M HCl (2.01pH)
2 a 1.0 M HCl (4.73) b 1.0 M NaOH (4.82) c Control (4.76)
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3. a 1.0 M HCl (10.09) b 1.0 M NaOH (11.98) c Control (11.11)
4. a 1.0 M HCl (9.13) b 1.0 M NaOH (9.38) c Control (9.30) |
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