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Volumetric Analysis

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Volumetric Analysis

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    1. Volumetric Analysis Titrations

    2. Titrations

    3. Titration Types By Reaction Type Acid/Base Complexometric Precipitation Redox

    4. Titration Calculations A 0.8345 g sample of potassium hydrogen phthalate required 38.31 mL of 0.1023 M NaOH to reach the endpoint. What is the concentration (M) of NaOH? A 10.00 mL sample of an HCl solution to be used as an acid standard required 28.45 mL of the previously standardized NaOH to reach the endpoint. What is the concentration of the HCl solution?

    5. Molecular Weight Determination A 0.1046 g diprotic organic acid acid required 23.47 mL of 0.1072 M standard KOH to reach the first endpoint. What is the molecular weight of the acid?

    6. Back Titration The concentration of Manganese in a water sample was measured using an EDTA back titration. Find the concentration of manganese if a 50.00 mL water sample was treated with 10.00 mL of 0.02041 M EDTA and required 3.21 mL of 0.00934 M Zn to reach the endpoint.

    7. Standardization Primary Standards: high purity air stability absence of hydrate water modest cost soluble large formula weight/mole * secondary standard with demonstrated assay can be used!

    8. A note about Reagents

    9. Keeping Analytical Reagents Pure Keep spatulas out! Pour from bottle to beaker or flask Never return reagents to the original container Replace caps immediately Do not place stoppers on benchtops Store chemicals in a cool, dry, dark place

    10. Standard Solutions: stable, no change in concentration react rapidly w/ analyte react completely w/ analyte react w/ known stoichiometry

    11. Titration Curves

    12. End Points & Indicators

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