Which statement about the determination of the percentage purity of benzoic acid is correct? * A- Only sodium hydroxide solution can be used as the titrant in the volumetric analysis of benzoic acid. B- Analysing a benzoic acid sample that still contains some hydrochloric acid may yield an analyte percentage that is less than expected.

Which statement about the determination of the percentage purity of benzoic acid is correct? * A- Only sodium hydroxide solution can be used as the titrant in the volumetric analysis of benzoic acid. B- Analysing a benzoic acid sample that still contains some hydrochloric acid may yield an analyte percentage that is less than expected.

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter88: Column Chromatography

Section: Chapter Questions

Problem 5P

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The thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid solution and titrated with 37.31 mL of 0.009372 M Hg2+ via reaction: 4(NH2)2CS + Hg2+ →[(NH2)2CS]4 Hg2+ Is this an example of total analysis technique or concentration technique? Explain.
You obtain an Unknown Sample from the Stockroom. You begin testing the solution through the steps outlined in the flowchart of the experiment’s PDF file. You first add HCl and centrifuge your mixture. You observe the formation of a white precipitate in the bottom of the test tube. After pouring off the supernatant liquid, you add hot water to the white precipitate. Upon addition of the hot water, you have some white precipitate still at the bottom of the test tube, and the supernatant liquid is poured off. To this liquid, potassium chromate (K2CrO4) is added. Upon this addition of potassium chromate, you observe no formation of precipitate. Which of the following is a valid conclusion to draw at this point? (Choose one.) Select one: 1. Hg22+ is definitely present. 2. Pb2+ is NOT present. 3. Ag+ is definitely present. 4. Pb2+ is definitely present.
Am I calculating this correctly? Single 10 mL Extraction and Determination of Distribution Coefficient 1) Calculation of initial amount of benzoic acid in grams Volume of benzoic acid solution: 50.00 mL Molarity of benzoic acid solution: 0.0205 M 50.00 mL x 1 L/1000 mL L x 0.0205 mol/L x 122.122 g/mol = 0.12517505 g ≈ 0.125 g of benzoic acid A2. Calculation of amount of benzoic acid (g) remaining in aqueous solution after extraction with 10 mL of methylene chloride BA + NaOH --> sodium benzoate + H2O BA = 0.0205 M NaOH = 0.0189 M NaOH volume used = 17.4 mL Moles of NaOH: 0.0189 mol/L x 17.4 mL x 1L/1000 mL = 0.00032886 moles of NaOH BA:NaOH = 1:1, therefore there is 0.00032886 moles of BA remaining in aqueous phase 0.00032886 moles BA x 122.122 g/mol = 0.04016106 g 0.12517505 g BA (original) - 0.04016106 g BA (remaining) = 0.08158944 g BA in 10 mL of dichloromethane If everything is done correctly, how would I calculate of the amount of benzoic acid (g) extracted into the…
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Consider the following scenario: You obtain an Unknown Sample from the Stockroom. You begin testing the solution through the steps outlined in the flowchart of the experiment’s PDF file. You first add HCl and centrifuge your mixture. You observe the formation of a white precipitate in the bottom of the test tube. After pouring off the supernatant liquid, you add hot water to the white precipitate. Addition of the hot water dissolves some of the precipitate, but some white precipitate still remains on the bottom of the test tube. You pour off the supernatant liquid, and add ammonia (NH3) to the remaining precipitate. You now observe the formation of a gray-black precipitate. Which of the following is a valid conclusion to draw at this point? Select one: 1. Hg22+ is definitely present. 2. Pb2+ is definitely present. 3. Ag+ could be present, or Hg22+ could be present, or BOTH could be present. 4. Ag+ is definitely present
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