CHM152LL LAB MANUAL COMPLEXOMETRIC DETERMINATION OF WATER HARDNESS Complexometric Determination of Water Hardness Introduction Complex ions When a neutral molecule or anion (a Lewis base) donates electron pairs and attaches itself to a metal ion center (a Lewis acid)‚ the resulting cluster‚ or complex‚ of atoms becomes a single complex ion. When such complexes form‚ the electron donating groups (called ligands) form coordinate covalent bonds through empty orbitals on the metal ion. An example
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There are many high-priority health issues otherwise known as Leading Health Indicators (LHIs) selected by the Healthy People initiative to improve the health of all Americans (U.S. Department of Health and Human Services [DHHS] (2017a). These LHIs encompass every aspect of a person’s life from pre-conception through old age along with actions that can be taken to help the Healthy People initiative attain their set goals. The public health topic that I have chosen to discuss is substance abuse in
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Part A: Table 1: Fractionation of amino acid Fraction No | Response to Ninhydrin test(level of blue colour change) | Response to Sakaguchi test (colour change) | 1 | X | yellow | 2 | Dark blue | yellow | 3 | Dark blue | Pale orange | 4 | Blue | Pale orange | 5 | Pale blue | Pale orange | 6 | Blue | Pale orange | 7 | Pale blue | Pale orange | Discussion Part A In the separation and purification of a single protein or amino acids‚ a solution containing the desired analyte
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analyze data and draw a conclusion. In this experiment I will find out that in a type of water the Alka-Seltzer will dissolve faster and slower. Alka-Seltzer is one of the world’s best known antacids. Its main function is to absorb excess stomach acid. II. MATERIALS: * Tap Water - Warm Water * Cold Water - Salt Water * Acidic Water -5 cups (250 mL of water in each cup) * A whole Alka-Seltzer tablet III. HYPOTHESIS: My hypothesis is that the Alka-Seltzer tablet
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Food Chemistry 138 (2013) 227–233 Contents lists available at SciVerse ScienceDirect Food Chemistry journal homepage: www.elsevier.com/locate/foodchem Analytical Methods Determination of volatile N-nitrosamines in meat products by microwave-assisted extraction coupled with dispersive micro solid-phase extraction and gas chromatography – Chemical ionisation mass spectrometry Man-Chun Huang‚ Hsin-Chang Chen‚ Ssu-Chieh Fu‚ Wang-Hsien Ding ⇑ Department of Chemistry‚ National Central
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ACIDS & BASES Acids/Bases Basics Acids and bases are common solutions that exist everywhere. Almost every liquid that we encounter in our daily lives consists of acidic and basic properties‚ with the exception of water. They have completely different properties and are able to neutralize to form H2O‚ which will be discussed later in a subsection. The table below compares the different properties between them: pH Scale Since acids increase the amount of H+ ions present and bases
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Abstract Rhesus typing is an important clinical technique which involves finding out whether some ones blood is RhD+ve or RhD-ve‚ it is important to find this out as it can have serious health complications if blood that is un compatible is mixed‚ either during pregnancy or transfusions. This experiment involved using the techniques of PCR to amplify the DNA collected‚ using electrophoresis to separate the DNA and using markers and positive controls of known size to determine the size of fragments
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Oxalic Acid Lab Aim: Use acid base titration to determine the number of water molecules in hydrated hydrochloric acid. Apparatus required: Oxalic acid solution 250 cm3 Weighing bottle Digital balance Beaker (250 cm3) Distilled Water Volumetric Flask 250cm3 Filter funnel Pipette Burette 50cm3 Retort Stand Beakers 100cm3 Standardized sodium hydroxide solution 0.1M Pipette filter Conical flasks 250cm3 Phenolphthalein Indicator Procedure 1) Rinse the burette with distilled
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Introduction A complex ion consists of a metal ion with Lewis bases attached to it. These Lewis bases form strong coordinate covalent bonds with the central complex ion in which both electrons of the bond are donated by the Lewis base. The Lewis bases that form this complex are referred to as ligands and they are typically either neutral molecules or anions. Polydentate ligands have multiple lone pairs of electrons that enable them to bond multiple atoms to the central metal atom. The stability
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Amplios Academy www.amplios.net White Paper Series KPIs Galore Wilson Fyffe‚ Singapore‚ 1 April 2011 Summary Purpose – The purpose of this paper is to examine why and how firms find resistance to performance measurement in the presence of proliferation of the same‚ leaving very valuable management information potential unrealized. Design/methodology/approach – The paper presents a framework for organizing performance measures into a manageable hierarchy‚ suitable for computerization and
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