PPT-19.2 Amino Acids as Acids and Bases

When an amino acid with positive and negative charges is overall neutral in charge it is said to be at its isoelectric point pI Ballandstick model of glycine at its pI of 60. Chemistry . Acids and Bases. Properties and pH. Chemical Warfare!. What is an Acid?. 3 Major Definitions: Arrhenius, Bronsted-Lowry, and Lewis.. Arrhenius and Bronsted-Lowry say an acid is:. A proton donor. 1. What are . acids. and how do they taste like?. What . acids. or . acidic . solutions. do you know?. What are . acids. and how do they taste like?. Taste: . sour, tart, tangy. What are . bases. Codons. Prefixes, Suffixes and Vocabulary. Poly. = many. Peptide bond . =bond between two amino acids.. Anti. = against, opposite. Dehydration. = loss of water. Polypeptide. = long assembled string of amino acids.. Acids/ BASES. Acids. When dissolved in water, it will . ionize . into positively charged hydronium ions (H. 3. O+) and negatively charged ions of some other element. . Bases. Also . known as an alkali. Some Important Acids. (All acids have H atoms). Properties of Acids. Sour Taste. Reacts with Metals (Produce Hydrogen Gas). Reacts with Carbonates (Produce CO2). Turn Litmus Paper Red. Natural Indicators. Chapter 8.1. Objectives. Describe the ionization of strong acids in water and the dissociation of strong bases in water.. Distinguish between solutions of weak acids or bases and solutions of strong acids or bases.. Explain the chemical composition of acids and bases, and explain the change of pH in neutralization reactions.. D12. I can differentiate between acids and bases.. Learning Target. When dissolved in water, they ionize (form ions). Dr. Ron . Rusay. Fall . 2012. Chapter. 3. Structure . and . Bonding. Acids and Bases. Models of Acids and Bases. Arrhenius. : Acids produce H. . & bases produce OH. . ion in aqueous solutions .. Different definitions of acids and bases. Acids are proton donors (. Brønsted. Lowry definition). they generate H. 3. O. +. in water (Arrhenius definition). Bases are proton acceptors. they generate OH. 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 .. backbone.  . atoms . (see aminoAcids1).  but a unique set of . side chain . atoms. It's the side chains that make the 20 amino acids different from each other. . 1. Use the three identical backbone pieces and three unique side chain pieces below to construct three amino acids in the space to the right.. imino. acid.” . Figure 5: Comparison of the secondary amino group found in proline with the primary amino group found in other amino acids such as alanine.. 2. Proline: . Proline differs from other amino acids in that its side chain and amino N form a rigid, five -member red ring structure (Figure 5). Proline, then, has a secondary (rather than a primary) amino group. It is frequently referred to as an “. BSc 3. rd. year . AMINO ACIDS. C. lassification of amino acids . Classification according to nature of side chain. PREPARATION OF AMINO ACIDS. 1. Gabriel Phthalimide synthesis. 2. Strecker’s synthesis. Objectives. Relate the process of ionization to the formation of acids and bases. Explain qualities of acids and bases . Compare the acidity of substances, using the pH scale and pH indicators . Use molarity and titration to determine the concentration of an acid .