ANACHEM LECTURE PRESENTATION August 18, 2012.pptx

ANACHEM LECTURE PRESENTATION August 18, 2012.pptx - K E N N...

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Analytical Chemistry Engr. Kenneth Soriano K E N N E T H
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Course Outline Solutions and Their Concentrations Gravimetric Analysis Acid – Base Equilibria Volumetric Analysis
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Solutions and Their Concentrations O OH O O Aspirin O OH Stearic Acid
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Molarity (M) Molar concentration is the number of that species that is contained in 1L of the solution
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Part per Million (ppm) For very dilute solutions, parts per million (ppm) is a convenient way to express concentration
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Parts per Million (ppm) A handy rule in calculating parts per million is to remember that for dilute aqueous solutions whose densities are approx. 1.00 g/mL,
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Parts per Billion (ppb)
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Normality (N) is the number of equivalents that is contained in 1L of the solution
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Normality
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Gravimetric Analysis O OH H H H Testosterone O O H H H Progesterone O O Anthraquinone
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Gravimetric Analysis Gravimetric Method of Analysis deals with the measurement of the mass of a substance that is chemically related to the analyte.
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Basic Steps on Precipitation Method Sample is dissolved in an appropriate solvent. A precipitant is used to convert the analyte into a sparingly soluble precipitate. The precipitate is converted into a product of known composition by a suitable heat treatment. The percentage of the analyte in the sample is calculated using the gravimetric factor (GF)
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Gravimetric Analysis WT. SAMPLE
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Prepare Solution of the Sample Choice of Solvent Water ( w/ or w/o heating) Non-Oxidizing Acids Oxidizing Acids (HNO 3 ) Aqua Regia (3:1 HCl:HNO 3 ) Fluxing Agents Acid: K 2 S 2 O 7 Redox: Na 2 O 2 Basic: Na 2 CO 3
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DISSOLVED SAMPLE EXCESS PRECIPITATING AGENT
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Precipitation of Analyte Elements / Ion Precipitated Precipitating Agent Final/Ignited Form Cl, Br, I AgNO 3 AgCl, AgBr, AgI Fe, Al ,Cr NH 3 Fe 2 O 3 , Al 2 O 3 , Cr 2 O 3 Mg NH 4 HPO 4 Mg 2 P 2 O 7 K H 2 PtCl 6 K 2 PtCl 6 Ni Dimethylglyoxime Ni – DMG Ca (NH 4 ) 2 C 2 O 4 CaC 2 O 4 - 110 °C CaCO 3 - 500 °C CaO - 800 °C
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PRECIPITATION OF THE ANALYTE
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FILTRATION AND IGNITION OF THE PRECIPITATE
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Gravimetric Analysis WT. FINAL FORM
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Calculations
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