CHEM 220 (CHEM 220)
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Exam (elaborations) CHEM 220 (CHEM 220)
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---17april 20212020/2021A+
- MODULE 8: 
 TEXTBOOK NOTES 
 
 (CHAPTERS 9, 10 and 11) 
 
 
CHAPTER 9 → MONOPROTIC ACIDS AND BASES IN AQUEOUS SOLUTIONS 
 
The solvent is both acidic and basic: 
2H O ⇌ H O+ + OH-	K = 1.0x10-14 at 25℃ 
 
pKw = -logKw = 14 
 
Is activity important? 
-	Activity can be important. Normally we neglect activities in pH calculations unless it is clearly needed (ex. Titration in a 0.1M salt solution which we will not be considering) 
 
At 25℃ neutral pH (=-log[H+]) = 7 because [H+]=[OH-] = √Kw...
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