Running the reaction: 2.50 g of benzoin and 0.39 g of tetrabutylammonium hydrogen sulfate were dissolved in 45 mL ethyl acetate in a 125 mL Erlenmeyer flask 19 mL of bleach, 10 m of water, and 9 mL of 0.05 M disodium hydrogenphosphate buffer were added The flask was closed with parafilm and clamped The mixture was stirred vigorously for 60 minutes during which it turned bright yellow Product isolation: The mixture was transferred to a senaratory funnel
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FIND PERCENT YIELD OF BENZIL
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- An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO2 free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 31.1 mL of the standard acid. How many millimoles of the components are there in the original solid sample? O 0.28 mmol Na,CO3 O 1.29 mmol NaOH, 0.97 mmol Na2CO3 O 0.103 mmol NaOH, 0.078 mmol NazCO3 O 1.29 mmol Na2CO3, 0.97 mmol NaHCO3 O Cannot be determined23 (H) Inorganic Analytical Chemistry CHEM 23 (H) FS-AY:20-21 Week 4-5: Quantitative Analysis by Gravimetry and Titration Quiz 4 My courses Exactly 24.69 mL of HCI is required to titrate a 278.0-mg sample of the tris(hydroxymethyl)aminomethane (MM: 121.14 g/mol), which is highly pure and free from absorbed water, according to the following balanced reaction: HOH -NH, + Cl" NH2 + HCl HO HO HO. HO. Calculate the molarity of the HCI solution. Answer: Next page gimSO3 + H20 by titration with permanganate in acidic pH: peroxide was diluted to 25 ml and analyzed The sample required 84.2 mL of 0.0175 M permanganate to reach the concentration of hydrogen peroxide in the original sample? 04+H202 →02 + Mn2+ NT COPY NRSITY What is the GE
- A 0.9092-g sample of a wheat flour was ana- lyzed by the Kjeldahl procedure. The ammonia formed was distilled into 50.00 mL of 0.05063 M HCI; a 7.46-mL back-titration with 0.04917 M NAOH was required. Calculate the percent- age of protein in the flour. 9-22.An unknown sample containing mixed alkali (naoh, nahco3, or na2co3) was analyzed using the double flask method. a 250 mg sample was dissolved in 250 ml co2 free water. a 20.0 ml aliquot of this sample required 11.3 ml of 0.009125 m hcl solution to reach the phenolphthalein end point. another 29.0 ml aliquot of the sample was titrated to the bromocresol green endpoint using 31.1 ml of the standard acid. how many millimoles of the components are there in the original solid sampleA 10.00mL sample of alcoholic ethyl acetate was diluted to 100.00 mL. 20.00 mL was aliquoted and mixed with 40.00 mL of 0.04672 M KOH. The resulting mixture was heated for 2 hours. CH3COOC2H5 + OH- → CH3COO- + C2H5OH After cooling, the excess OH was back titrated with 3.41 mL of 0.05042 M H2SO4. Answer the following: Calculate the number of moles of OH- that reacted with ethyl acetate. Calculate the number of moles of ethyl acetate in the 20.00 mL solution. What is the mass of ethyl acetate (FW=88.11 g/mol) in the original 10.00 mL sample?
- 5. A 300.0 mg sample containing Na,CO3, NaHCO3 and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 mL to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO, free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 311 mL of the standard acid. What is/are the component/s of the sample? O Cannot be determined O NAHCO3 only O NAOH and Na,CO3 O NazCO3 only O NAHCO, and Na2CO3An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO, free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 31.1 mL of the standard acid. What is/are the component/s of the sample? O NazCO3 only NaHCO3 only O NAHCO3 and Na>CO3 NaOH and NazCO3 O Cannot be determined
- 5. A 300.0 mg sample containing Na,CO3, NaHCO, and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 ml to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.The ethyl acetate concentration in an alcoholic solution was determined by diluting a 10.00-mL sample to 100.00 mL. A 20.00-mL portion of the diluted solution was refluxed with 40.00 mL of 0.04672 M KOH:CH3COOC2H5 + OH- → CH3COO- + C2H5OHAfter cooling, the excess OH2 was back-titrated with 3.41 mL of 0.05042 M H2SO4. Calculate theamount of ethyl acetate (88.11 g/mol) in the original sample in gramsAn unknown sample containing mixed alkali (NaOH / NaHCO3 / Na2CO3) was analyzed using the double titration method. A 250-mg sample was dissolved in 250-mL CO2 free water. A 20.0-mL aliquot of this sample required 11.3-mL of 0.009125M HCl solution to reach the phenolphthalein endpoint. Another 20.0-mL aliquot of the sample was titrated to the bromocresol green endpoint using 31.1-mL of the standard acid. What is/are the component(s) of the sample? How many mmol of the components are there in the original solid sample?