17 Acid-Base Salts & Calculations

17 Acid-Base Salts & Calculations - Lactic acid (pKa =...

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1 Lactic acid (pK a = 3.86) is found in milk. Tartaric acid (pK a1 = 2.98) is found in wine. Assuming the concentrations are the same and only these compounds contribute to the acidity, which would be the more acidic and have the lower pH? A) Milk B) Wine [HA] ] ][A O [H K 10 K - 3 a -pK a a lactic acid 2 Why some salts are basic. A salt composed of a conjugate base of a weak acid produces a basic solution, e.g. NaF. NaF(s) Na + (aq) + F - (aq)
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3 Why some salts are acidic. A salt composed of a conjugate acid of a weak base produces an acidic solution, e.g. NH 4 Cl. NH 4 + (aq) + H 2 O NH 3 (aq) + H 3 O + (aq) NH 4 Cl(s) NH 4 + (aq) + Cl - (aq) 4 Why some oxides act as bases. Oxides of metals accept protons and neutralize acidic solutions.
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5 Why some oxides act as acids. Oxides of nonmetals combine with water to produce oxyacids. Power plants that burn coal produce SO 2 and consequently acid rain that has a negative impact on plant life. Sulfur dioxide + water sulfurous acid SO 2 (g) + H 2 O(l) H 2 SO 3 (aq) 6 Acid – Base Properties of Salts Salts are formed from acid base reactions. Four possibilities! Strong Acid + Strong Base Strong Acid + Weak Base Weak Acid + Strong Base Weak Acid + Weak Base
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7 Strong Acid + Strong Base: NaCl HCl(aq) + NaOH(aq) Na+(aq) + Cl (aq) + H 2 O(l) Na + and Cl do not react with water.
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This note was uploaded on 10/05/2011 for the course BIO 203, CH taught by Professor Lacey,simmerling,deng,hanson during the Fall '10 term at SUNY Stony Brook.

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17 Acid-Base Salts & Calculations - Lactic acid (pKa =...

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