Lecture3 - Chapter 6 Direct titration Good Titrations 10CO2...

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Chapter 6 Good Titrations 5C 2 O 4 2- + 2MnO 4 - + 16H + Æ 10CO 2 + 2Mn 2+ + 8H 2 O analyte titrant Direct titration Analyte : x M ; 25.00 mL Mole of permanganate solution = 0.05 M x (12.50 -0.03) mL x 10 -3 L/1 mL = 6.235 x 10 -4 mole M (oxalate ion) = M 10 6.235 MnO mole 2 O C mole 5 L 10 25.00 MnO mole 10 6.235 2 - 2 4 - 2 4 2 3 2 4 4 × = × × × The volume of permanganate solution (0.05 M) required to reach the end point: 12.50 mL The volume of permanganate solution required for a blank titration : 0.03 mL
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Standardization of a titrant Primary standard, a reagent that is pure (>99.9%) and stable enough, is required as a standard solution to decide the concentration of a secondary standard. HCl + Na 2 CO 3 Æ H 2 CO 3 + 2NaCl FM 105.99 primary standard NaOH + CO 2 H CO 2 K Æ H2O + CO 2 Na CO 2 K FM 204.22 Potassium hydrogen phthalate 2KMnO 4 + 5Na 2 C 2 O 4 + 8H 2 SO 4 Æ 10CO 2 + 2Mn 2+ + 8H 2 O + 2K + + 10Na + + 8SO 4 2- primary standard
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Example: Standardization of a reagent 3. x M 10.00 mL H 2 SO 4 solution reacted with 33.45 mL of NaOH to make an end point. Find the molarity of H 2 SO 4 solution. 2. Standardization of NaOH solution:
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This note was uploaded on 04/17/2008 for the course CHEM 2114 taught by Professor Wi during the Spring '08 term at Virginia Tech.

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Lecture3 - Chapter 6 Direct titration Good Titrations 10CO2...

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