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Bases

Acids. and. Bases. pH. There are many ways to consider acids and bases. One of these is pH. [H + ] is critical in many chemical reactions. A quick method of denoting [H + ] is via pH. By definition pH = – log [H 3 O + ], [H 3 O + ] = 10 -pH

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Bases

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  1. Acids and Bases

  2. pH • There are many ways to consider acids and bases. One of these is pH. • [H+] is critical in many chemical reactions. • A quick method of denoting [H+] is via pH. • By definition pH = –log [H3O+], [H3O+] = 10-pH • The pH scale, similar to the Richter scale, describes a wide range of values • An earthquake of “6” is 10 as violent as a “5” • Thus, the pH scale condenses possible values of [H+] to a 14 point scale (p388) • Also, it is easier to say pH=7 vs. [H3O+]=1x10–7

  3. Calculations with pH Q: What is the pH if [H3O+]= 6.3 x 10–5? pH = –log [H3O+] (‘6.3’, ‘exp’ or ‘EE’, ‘5’, ‘+/-’, ‘log’, ‘+/-’) (‘-’, ‘log’, ‘6.3’, ‘exp’ or ‘EE’, ‘-’, ‘5’) Ans: 4.2 Q: What is the [H3O+] if pH = 7.4? [H3O+] = 10–pH mol/L (’10’, ‘xy’, ‘7.4’, ‘+/-’, ‘=‘) (’10’, ‘^’, ‘-’, ‘7.4’, ‘=‘) 3.98x10–8 M

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