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Published byNorman Godwin Johns Modified over 9 years ago
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Salts in Solution Mrs. Coyle
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Solutions of Salts -Strong Acids and Strong Bases Produce a neutral solution (pH=7) Example: HCl + NaOH NaCl + H 2 O Strong Acid Strong Base Neutral Solution
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Solutions of Salts -Strong Acids and Weak Bases Produce an acidic solution (pH<7) Example: HCl + NH 3 NH 4 Cl + H 2 O Strong Acid Weak Base Acidic Solution
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Solutions of Salts -Weak Acids and Strong Bases Produce a basic solution (pH>7) Example: H 2 C O 3 + KOH K 2 C O 3 + H 2 O Weak Acid Strong Base Basic Solution
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Solutions of Salts -Weak Acids and Weak Bases The pH of their salt’s solution depends on their relative strength.
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Summary Strong Acid + Strong Base Neutral Solution Strong Acid + Weak Base Acidic Solution Weak Acid + Strong Base Basic Solution
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Why does this happen? Salt Hydrolysis Ions of the dissociated salt, remove or donate H +, to the solution.
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Example NH 4 Cl (aq) NH 4 + (aq) + Cl - (aq) NH 4 + (aq) + H 2 O (l) NH 3 (aq) + H 3 O + (aq) The H 3 O + concentration is greater than that of OH -, so the solution is acidic.
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Titration of Weak Acid with Strong Base http://www.chem.ubc.ca/courseware/pH/section14/ph2.jpg Equivalence Point is pH=8.7 Note: Equivalence point of pH=7 for HCl(strong) and NaOH(strong)
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Buffers Solution in which the pH remains relatively constant when a small amount of acid or base is added to the solution. They are generally a weak acid and its salt or a weak base and its salt.
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Examples of Buffers H 2 CO 3 and the salt of HCO 3 - (in human blood) NH 3 and the salt of NH 4 +
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Indicators
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