ch7 Titrations - Chapter 7 Introduction of Titrations...

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Chapter 7 Introduction of Titrations Principle of Titration Detection of Equivalence Point Indicator Features and Application
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7.1 Titration Advantages of Tirimetric Method: Rapid, Convenient, Accurate, Readily automated
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(1). Titration type: Volumetric: volume of standard is measured. Gravimetric: mass of standard is measured, eg. Mohr method(Cl-Ag-CrO 4 ). Coulometric: time at constant current is measured, i.e., amount of charge.
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(2) Terms Standard Solution (Standard Titrant): Reagent of known concentration that is used to carry out the analysis. Question: To measure ammonia content by directly titrating the ammonia solution with 0.1000 M HCl, what is the standard solution?
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Titration: Performed slowing by adding standard solution from a buret until the reaction is judged to be complete.
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Equivalence Point : The point when the amount of added titrant is chemically equivalent to the amount of analyte in the sample. End Point : The point at which an indicator physically changes representing the estimated equivalence point (color or turbidity change). Titration error=Vep-Veq
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The end point of a titration is defined as: (a) the equivalence point of the titration. (b) the actual measured volume of titrant required to complete a titration. (c) the volume associated with actual stoichiometric quantity of titrant required to complete a titration.
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In the following reaction: CaCO 3 + 2HNO 3 →Ca(NO 3 ) 2 + CO 2 + H 2 O how many mL of 0.1015 molar HNO 3 are required to react with 0.9857 grams of CaCO 3 ? (a) 0.1940 mL (b) 97.04 mL (c) 194.1 mL
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Argentometric titrations, typically, are titrations using a standard solution of silver ions to form a silver halide precipitate. Calculate the pAg + value when 25.0 mL of 0.100 M AgNO 3 is added to 25.0 mL of 0.0500 M chloride ion. (a) 4.87. (b) 1.60 (c) 8.14
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Exercises Ascorbic acid (vitamin C) reacts with according to the equation Starch is used as an indicator in the reaction. The end point is marked by the appearance of a deep blue starch-iodine complex when the first fraction of a drop of unreacted remains in the solution.
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