PPT-Q Acid-Base Indicators: Spectrophotometric Methods

Dr Prem D Sattsangi Copyright 2009 1 Molar Absorptivity Define Molar Absorptivity Calculate the molar absorptivity with the following data 125 x 10 4 M solution has 045 OD absorbance at the . Hydrogen Ions and Acidity. Section 19.2. To test a diagnosis of diabetic coma, a doctor orders several tests, including the acidity of the patient’s blood. Results from this test will be expressed in units of . Dr. Prem D. Sattsangi. Copyright © 2009. 1. Molar Absorptivity. Define Molar Absorptivity. Calculate the molar absorptivity with the following data. 1.25 x 10. -4. M solution has 0.45 O.D. absorbance at the . Titration. Acid–Base Titration. The concentration of a weak acid or a weak base in water is difficult – if not impossible – to measure directly.. But we can calculate the concentration from the results of titration.. Dr. Prem D. Sattsangi. Copyright © 2009. 1. Molar Absorptivity. Define Molar Absorptivity. Calculate the molar absorptivity with the following data. 1.25 x 10. -4. M solution has 0.45 O.D. absorbance at the . Lecture Presentation. James F. Kirby. Quinnipiac University. Hamden, CT. © 20. 15. Pearson Education, Inc.. 16.1 & 16.2 Some . Definitions. Arrhenius. An acid is a substance that, when dissolved in water, increases the concentration of hydrogen ions.. 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.. Learning Objectives. Describe . what is meant by acids, bases and . buffers. List . normal pH of the body fluids. . Describe . the processes involved in maintenance of normal blood pH. .. Describe . various types of acidosis and alkalosis. Lecture 5. Introduction. A complex system of chemical buffers together with highly specialized mechanisms of the lungs and kidneys continuously work together to ensure a precise balance of water, electrolytes, and pH in both the intracellular and extracellular compartments of the human body. . …. .. Acids & Bases are Based on WATER!. Depending on the amount of H+ or OH- ions, the “water” becomes either acidic or basic (aka alkaline). The pH scale determines the strength of the acid/base. Strong Acids. HCl. HBr. HI. HNO. 3. HClO. 4. H. 2. SO. 4. Acid: a species that supplies H. +. ions to water. Strong acid: an acid that completely ionizes in water forming an H. +. ion and an anion. .. Acid-Base Titration. .. المحاضرة الثانية للجزء العملي. . . Acid-Base Titration. . Analytical chemistry. : is the analysis of material samples to understanding of their chemical composition and structure. It has a wide range of monitoring pollution in the environment, development of new materials, and drug manufacture.. Acid-base balance.  . * Acids are electrolytes that release hydrogen ions (H+) when they are dissolved in water.. * Bases are electrolytes are release hydroxide ions (OH-) when they are dissolved in water.. • Acid –Base indicators. • Mixed indicators. • Fluorescent indicators. 2.. MIXED INDICATORS:. They are mixtures of usual acid bases indicators and orange dyes. They are used to increase the sharpness of the visible end point.. Acid. is defined as a substance which when dissolved in water gives hydrogen ions. (H +) . Examples.. Base is defined as a substance which when dissolved in water gives hydroxyl ions. (OH-) . Examples..