Exp 9 The Properties of Salts and Buffers.pptx - Properties...

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Properties of Salts and Buffers
Objectives Study the acid-base properties of salts and its component ions based on pH measurements. Study the properties of a buffer solution. Use a pH Sensor to monitor pH as you titrate a given volume of the commercial brand of lemonade drink. Use a pH Sensor to monitor pH as you titrate an unbuffered solution of 0.010 M citric acid. Compare the results of the unbuffered solution with the lemonade buffer system.
© 2017 Pearson Education, Inc. Conjugate Acid–Base Pairs In a Brønsted–Lowry acid–base reaction, the original base becomes an acid in the reverse reaction. the original acid becomes a base in the reverse process. Each reactant and the product it becomes is called a conjugate pair .
© 2017 Pearson Education, Inc. Acidic and Basic Solutions All aqueous solutions contain both H 3 O + and OH ions. The acidity or basicity of a solution is often expressed by pH . pH = −log[H 3 O + ] Neutral solutions [H 3 O + ] = [OH ] = 1.00 × 10 −7 – pH water = −log[1.00x10 −7 ] = 7 Need to know the [H 3 O + ] concentration to find pH Acidic solutions Basic solutions [H 3 O + ] > [OH ] [H 3 O + ] < [OH ] pH < 7 pH > 7 If you know pH, find [H 3 O + ] [H 3 O + ] = 10 −pH
What Does the pH Number Imply? .
© 2017 Pearson Education, Inc.
© 2017 Pearson Education, Inc. Acid–Base Properties of Ions and Salts Salts are ionic compounds. Soluble salts form ions in solution. Cation of a strong base and anion of a strong acid do not ionize water; hence, it doesn’t affect solution pH. Cation of a weak base and anion of a weak acid will ionize water and affect the pH of solution. NaHCO 3 solutions are basic. Na + is the cation of the strong base NaOH. HCO 3 is the conjugate base of the weak acid H 2 CO 3 .

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