PPT-Titration of weak acids Titration of amino acids

Amino acids are weak polyprotic acids Neutral amino acids are gly ala threonine are treated as diprotic acids acidic amino acids glu asp are treated as triprotic acids . What are amino acids?. Amino acids are the building blocks of proteins.. In the body, they exist as zwitterions.. Zwitterions can behave as both an acid or a base.. Today we will:. Study . the acid-base properties of amino acids, . HNO. 2. HNO. 3. Which is the stronger base?. N. O. 2. -. N. O. 3. -. Acid-Base Reactions. strong acid + strong base. strong acid + weak base. weak acid + strong base. weak acid + weak base. Extent of Weak Acid-Weak Base Reactions. acetic acid, CH. 3. COOH, . pKa. = 4.8. 1.0. 0.8. 0.6. 0.2. 0.4. OH. -. equivalents. pH:. A. H. A. -. H. +. [A. -. ] . : [HA] = 1 : 1000. pH: . 1.8. = . pK. a. –3.0. Titration of a weak acid. acetic acid, CH. Titration of a Strong Acid by a Strong Base. Consider what happens to the pH of 25 mL of 0.2 M . HCl. as it is titrated with 25 mL of 0.2 M . NaOH. . This result is shown in the diagram to the right. The diagram is referred to as a ___________________ _____________. . Stryer. Short Course. Chapter . 3. Amino Acid Structure. Alpha carbon. Sidechain. Proteins. peptides. Stereochemisty. L-amino acids. Glycine. R/S . vs. D/L. L-isoleucine. racemization. Ionization of Amino Acids. HNO. 2. HNO. 3. Which is the stronger base?. N. O. 2. -. N. O. 3. -. Acid-Base Reactions. strong acid + strong base. strong acid + weak base. weak acid + strong base. weak acid + weak base. Extent of Weak Acid-Weak Base Reactions. acetic acid, CH. 3. COOH, . pKa. = 4.8. 1.0. 0.8. 0.6. 0.2. 0.4. OH. -. equivalents. pH:. A. H. A. -. H. +. [A. -. ] . : [HA] = 1 : 1000. pH: . 1.8. = . pK. a. –3.0. Titration of a weak acid. acetic acid, CH. of the . Concentration . and . the Acid Dissociation Constants . of an . Unknown Amino Acid. Scheduling. This week in lab: . . Tuesday/Wednesday: Check-in and Pipette calibration. Thursday/Friday: Start of experiment . Understand the acid-base theories of Arrhenius, Brønsted-Lowry,. and Lewis.. Identify strong acids and bases and calculate their pH’s.. Calculate the pH of a weak acid or base.. Calculate the concentration of a strong or weak acid or base from . 2009, Prentice-Hall, Inc.. Titration. In . this technique a known concentration of base (or acid) is slowly added to a solution of acid (or base. ).. The . analyte. - is the solutions being evaluated and is of unknown concentration.. . are organic molecules that are the building block of . . proteins. .. -There is 20 . α. -amino acids commonly found in . proteins. . ( . they . have a carboxyl group and an amino group . . . Chapter 14. Section 1 – Properties of Acids and Bases. Section 2 – Acid Base Theories. Section 3 – Acid Base Reactions. 14.1 Properties of Acids and Bases. List. five general properties of aqueous acids and bases.. . Munther. . . Protein Structure . & Function. . Amino Acids . Aims of The Lecture. . . . The students should be learning about Amino acids:. The structures and types.. The importance and functional role. . Proteins. Part I. Dr. Ravish Chauhan. Associate Professor. IGN College, Ladwa. . . Amino Acids. . These are the compounds which contain both amino and carboxylic group.