28 Model of the Apparatus glyph817ote A second iron ring can be placed around

28 model of the apparatus glyph817ote a second iron

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28 Model of the Apparatus : glyph817ote: A second iron ring can be placed around to top of the beaker for added security if necessary. ~3.0 g of unknown copper salt + 100.0 mL H 2 O Experiment #5 Barnett
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29 Model of Vacuum Filtration Using a Büchner Funnel Clamp filter flask securely to a ring stand before affixing vacuum tubing and turning on vacuum. Büchner Funnel Filter Flask Thick Vacuum Tubing FilterVac Experiment #5 Barnett
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30 Experiment #6B: A Volumetric Titration; Quality Control Analysis of the Acetic Acid Content in Vinegar Introduction to Volumetric Analysis and Titrations : 1) Volumetric analysis is an investigative method used to quantitatively determine the concentration of an unknown analyte in a specified volume. 2) A titration is the laboratory technique employed to perform a volumetric analysis. a. In a titration, a standard solution of a known concentration (the titrant) is reacted with the analyte of an unknown concentration (or titrand). i. The titrant is commonly a strong acid or base. ii. The analyte (titrand) is commonly a weak acid or weak base. b. As the titrant is slowly added to the analyte (which generally contains an added indicator), a visible color change is observed when the endpoint is reached. c. This visual observance of the endpoint of a titration is commonly used to determine the equivalence point, the point where equivalent amounts of titrant and unknown are present and the reaction is complete. 3)A volumetric analysis is most often performed with the aid of a buret. 4) A buret (or burette ) is a laboratory instrument used to precisely measure the amount of a titrant delivered to an analyte solution. a.Burets are cylindrical glass tubes, used vertically, with a stopcock on theend which controls titrant delivery.b.These instruments are very accurate analytical tools to measure deliveredvolumes.c.A depiction of a buret reading is show on the left. Introduction to Concentration : 1) Concentration is the amount of solute present in a given amount of solvent or solution. 2) Concentration can be expressed using different units. a. Molarity ( M ) is defined as the moles of solute dissolved in one liter (cubic decimeter) of solution. i. Molarity ( M ) = (moles of solute) / (liter of solution) b. Mass percentage (or percentage by mass) is defined as the mass of solute dissolved in the mass of solution times 100 percent. i. Mass percentage = [(mass of solute) / (mass of solution)] x 100% Introduction to Quality Control and Statistical Data : 1) Quality control (QC) is a practice for ensuring the preservation of proper standards in manufactured materials by employing regular but random inspection of product quality. 30 31 Measurement of 30.40 mL delivered via a buret Experiment #6B Barnett
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31 2) QC is utilized in almost every industry including manufacturers of food, drugs, and industrial and commercial products.
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  • Spring '19
  • Chemistry, Chemical reaction, Timothy Barnett

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