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List the advantages and disadvantages of a potentiometric titration relative to a direct potentiometric
measurement.
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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 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 determinedAn 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 determined
- 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 sampleWhat is the function of masking agent in EDTA titration?Give six differences between tituration and levigation
- A solution containing Mg2+ was buffered to pH 9.75 and titrated with EDTA. Eriochrome black T, with pKa1 = 6.3 and pKa2 = 11.6 was used as the indicator. It is a diprotic acid, H2E What is the fraction of the predominant form of eriochrome black T in solution at this pH? (To answer this, report the alpha fraction of the indicator's most prevalent species at this pH) Review text sections 10.4 and 10.5 for help with this!An 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?In the Assay of Sodium Chloride, what is the purpose of adding nitric acid in the solution? It is used to prevent precipitation of silver as carbonate It is used to hasten chemical reaction It is used to precipitate silver bromide It is used to form a film over silver nitrate precipitate What is the permanent color expected at the end point in the standardization of 0.1 N Ammonium Thiocyanate? * Orange red Blue Red Yellow In the Standardization of 0.1 N Silver Nitrate, what is the purpose of allowing the mixture to stand in the dark? * It is used to aid in the formation of precipitate with large particles It is used to prevent the production of free silver It is used to acquire a purplish color in the precipitate It is used to maximize the reduction of silver chloride In the standardization of 0.1 N Silver Nitrate, what is the most suitable temperature to dry the Silver Chloride precipitate to constant weight? * 115° C 110° C 100° C 120° C Which is NOT…
- In the preparation of the standard curve for protein analysis, 50 mn BSA (bovine serum albumin) dissolved in H2O to a final volume of 5 mL was used as stock solution. What is the weight of BSA in 0.1 mL of stock solution? In 0.2 mL?A 567.9 mg sample containing Na2CO3, NaHCO3 , NaOH and inert material was dissolved and titrated with 0.1002 M HCl. The titration required 24.30 mL to reach the phenolphthalein endpoint and an additional 38.67 mL to reach the methyl red endpoint. Determine the composition of the sample and the % of each titrated component.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.