Lec-22-Chap16-3-bare

Lec-22-Chap16-3-bare - Lec-22-Chap16-3-bare 10/24/2011...

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Lec-22-Chap16-3-bare 10/24/2011 Acids and Bases. Ionization constants. pH of weak acid solutions 1 Lec-22: Acids and Bases Chapter 16 1 Acid-Base Calculations             3 0 2 0 HClO aq H O aq HC init. chan lO 0 HClO C ge eq lO aq 0 l. O ui H xx x x x x       2 3 00 HO HClO HClO HC C lO a x K x x x x     Hypochlorous acid HClO has an ionization constant of K a =3.2×10 –8 in water at 25°C. What is the pH of a solution that is 0.35 mol L –1 in HClO? Assuming that because the ionization constant is so small   0 HClO x 2
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Lec-22-Chap16-3-bare 10/24/2011 Acids and Bases. Ionization constants. pH of weak acid solutions 2 Acid-Base Calculations     2 00 HClO HClO a x x x K x we can approximate       8 41 0 HClO 0.35 1.06 3 10 mo .2 1 lL 0 a x K   This agrees with the exact calculation (without neglecting x in the denominator).   3 pH log H O log 3.9 x       3   4 3 0 mol mol HClO 0.35 H O 1.06 10   Indeed Acid-Base Calculations             23 2 2 2 0 2 0 HNO aq H O aq HNO HO NO aq 0 0 HNO xx x        2 3 22 0 2 2 0 HNO HNO H NO a x K x x x x HNO 2 has an ionization constant of K a =4.5×10 –4 in water at 25°C. What is the pH of a solution that is 0.00007 mol L –1 in HNO 2 ? If we assume that   2 0 HNO x 4
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Lec-22-Chap16-3-bare 10/24/2011 Acids and Bases. Ionization constants. pH of weak acid solutions 3 Acid-Base Calculations     2 22 00 HNO HNO a K xx x x The approximation then gives       5 4 1
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-22-Chap16-3-bare - Lec-22-Chap16-3-bare 10/24/2011...

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