Chap11LecB - DRAFT (Chap 11) Page 13 Salts produced in...

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DRAFT (Chap 11) Page 13 Salts produced in neutralization reactions. From Chapter 6: “A salt is a neutral product produced in an acid/base neutralization (an ionic compound, often aqueous).” HCl + NaOH → NaCl + H 2 O Results in neutral sol’n (if 1:1 ratio of reactants is mixed) CH 3 COOH + NaOH → H 2 O + NaCH 3 CO 2 Results in a basic sol’n (if 1:1 ratio of reactants is mixed) WHY?? CH 3 COOH + NaOH H 2 O + Na + + CH 3 CO 2 - CH 3 CO 2 - + H 2 O → CH 3 COOH + OH - 1. If you start with a weak acid and a strong base , when you have combined equal amounts of acid and base, the resulting solution will be slightly basic .
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DRAFT (Chap 11) Page 14 2. If you start with a weak base and a strong acid , when you have combined equal amounts of acid and base, the resulting solution will be slightly acidic . 3. If you start with a weak base and a weak acid , when you have combined equal amounts of acid and base, the resulting solution will tend to be neutral. 4. If you combine a strong acid and a strong base in equal amounts, the resulting solution will be neutral. Remember that as K a goes down, K b goes up (K a x K b = K w = 1x10 -14 ) CH 3 COOH + NaOH H 2 O + Na + + CH 3 CO 2 - HF + NaOH H 2 O + Na + + F - K a for CH 3 COOH = 1.8 x 10 -5 K a for HF = 7 x 10 -4 Which of the above is the stronger acid? Which of the above is the weaker acid? Both of the above neutralization will result in a slightly basic solution. Which of the above neutralization rxns would result in the more basic soln?
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DRAFT (Chap 11) Page 15 Determine the hydroxide ion concentration of a 0.10 M solution of sodium acetate in water. The K a of acetic acid is 1.8 x 10 -5 .
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DRAFT (Chap 11) Page 16 Metal cations (often found in neutralization salts) can also act as acids
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Chap11LecB - DRAFT (Chap 11) Page 13 Salts produced in...

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