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by: Brady Spinka


Marketplace > University of Texas at Austin > Chemistry > CH 204 > INTRO TO CHEMICAL PRACTICE
Brady Spinka
GPA 3.98

Brian Anderson

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Brian Anderson
Class Notes
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This 3 page Class Notes was uploaded by Brady Spinka on Monday September 7, 2015. The Class Notes belongs to CH 204 at University of Texas at Austin taught by Brian Anderson in Fall. Since its upload, it has received 25 views. For similar materials see /class/181867/ch-204-university-of-texas-at-austin in Chemistry at University of Texas at Austin.

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Date Created: 09/07/15
CH204 Fall 2008 Cheat Sheet for Experiment 4 AcidBase Titration 1 Standardization of NaOH Solution C3H404KH NaOH gt C3H404KNa H20 J KHP At the equivalence paint Moles of KHP Moles of NaOH Known Mass of KHP g Volume of NaOH used in titration ml To be determined Molarity of NaOH moleL Calculations 1 Moles KHP MW KHP 2 Moles NaOH Moles KHP Moles NaOH VNaOH 3M NaOH 2 Determination of the Unknown Acid Concentration Example HCl NaOH gt NaCl H20 At the equivalence paint Moles HCl Moles NaOH Known Molarity of NaOH from Part 1 moleL Volume of NaOH used in titration ml Volume of the unknown acid ml To be determined Molarity of HCl moleL Calculations 1 Moles NaOH MMOH mole L X VMOH L 2 Moles HCl Moles NaOH this equation will be different for H2S04 Moles HCl 3 M HC VH0 L CH204 Fall 2008 Cheat Sheet for Experiment 4 AcidBase Titration 3 Determination of an Acid Content of a Fruit Juice C3HSOCOOH3 3 NaOH gt C3HSOCOO3Na3 3 H20 At the equivalence paint Moles C3HSOCOOH3 g X Moles NaOH Known Molarity of NaOH from Part 1 moleL Volume of NaOH used in titration ml Volume of the juice sample ml To be determined g of C3HSOCOOH3 per 100 g of juice Calculations 1 Moles NaOH MMOH mole L X VMOH L 2 Moles C3HSOCOOH3 X Moles NaOH 1 3 U Mass g of C3HSOCOOH3 Moles C3HSOCOOH3 gtlt MW gmole Mass g C3HSOCOOH3 X 100 ml 4 Mass g C3HSOCOOH3 perlOO g juice Vjuice m1 CH204 Fall 2008 Cheat Sheet for Experiment 7 Visible Spectrophotometry Molecular Formula Determination Part 3 Standard Iron Solution Calculations Dilution calculations M1V1 MZVZ where M1 and M2 are the malarities afthe Original cancentrated and the nal dilute salutians and V1 and V2 are the valumes afthe Original cancentrated and the final dilute salutians Calculations 1 Convert gL into a moleL concentration for the standard Fe2 solution 2 Calculate the molarin of the stock Fephen32 solution prepared from the standard Fe2 solution using the stoichiometry of the following equation note that 110 phenanthroline is used in excess in this reaction Fe2 aq 3 phen aq gt Fephen32 aq 3 Calculate the molarities of the five standard Fephen32 solutions prepared from the stock Fephen32 solution dilutian calculatians Part 4 Iron Content Determination by Visible Spectrophotometry Beer s law A 61 0 Known Absorbance of the Fephen32 sample A Molar absorptiVity for Fephen32 at 510 nm M lcm 1 Dilution factors Pathlength l 1 cm Mass of the complex iron sample analyzed g To be determined Moles of Fe3 per gram of sample moleg 2 A Calculations 1 M Fephen3 7 moleL a 2 Total dilution factor 5 X 5 X X Where X is your final dilution 3 Mmgiml Fe3 M Fephen gtlt Total dilution factor 4 In 25 ml of solution moles Fe3 Mmgml Fe3gtlt 0025L 3 5 Moles Feyg sample 2 mass of sample g KxFeyC204xZHZO Molecular Formula Determination Known Moles of CZO4Z per gram of sample moleg sample Moles of K per gram of sample moleg sample Moles of Fe3 per gram of sample moleg sample y 1


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