A 0.2028 g sample of primary standard grade Na2C2O4 (M.M. = 134.00) was dissolved in 100 mL of 1 M H2SO4. The solution required 22.42 mL of the KMnO4 solution to reach the phenolphthalein end point. Titration of the blank (100 mL of 1M H2SO4) required 0.02 mL of the KMnO4 solution. What is the molarity of KMnO4

A 0.2028 g sample of primary standard grade Na2C2O4 (M.M. = 134.00) was dissolved in 100 mL of 1 M H2SO4. The solution required 22.42 mL of the KMnO4 solution to reach the phenolphthalein end point. Titration of the blank (100 mL of 1M H2SO4) required 0.02 mL of the KMnO4 solution. What is the molarity of KMnO4

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.32QAP

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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.
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.
A 0.5131-g sample that contains KBr (MM: 119.0023) is dissolved in 50 mL of distilled water. Titrating with 0.04614 M AgNO3 requires 25.13 mL to reach the Mohr end point. A blank titration requires 0.65 mL to reach the same end point. Report the %w/w KBr in the sample.
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 sample with a mass equal to 0.7500 g may contain NaHCO3, Na2CO3 and/or NaOH. The sample was dissolved and titrated with a 0.1090 mol L-1 HCl solution, spending 23.00 mL to reach the phenolphthalein end point and another 15.00 mL to reach the methyl orange end point. a) Deduce the composition of the sample b) Calculate the % (w/w) of the components. Data: Na = 22.99 O = 16.00 H = 1.008 C = 12.01
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 Na2CO3 O 1.29 mmol NAOH, 0.97 mmol Na2CO3 O 01 mmol NaOH, 0.078 mmol NazCO3 O 1.29 mmol NażCO3, 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 sample
The Merck Index indicates that 10 mg of guanidine,CH5N3, may be administered for each kilogram of bodymass in the treatment of myasthenia gravis. The nitrogenin a 4-tablet sample that had a total mass of 7.50 g wasconverted to ammonia by a Kjeldahl digestion, followedby distillation into 100.0 mL of 0.1750 M HCl. Theanalysis was completed by titrating the excess acid with11.37 mL of 0.1080 M NaOH. How many of thesetablets represent a proper dose for a patient who weighs(a) 100 lb, (b) 150 lb, and (c) 275 lb?
3. A 2.0g sample of juice from a fresh lime was diluted with water and filtered to remove the suspended matter. The clear liquid required 40.39mL of 0.04022M NaOH for titration to the phenolphthalein end point. Calculate the % acidity as % citric acid. Equation: H3C6H5O7 + 3NaOH Na3C6H5O7+ 3HOH
0.641 g of a semi-synthetic alkaloid was dissolved in 25 ml of 1% w/v acetic acid and wasanalysed directly by HPLC. The solution was found to contain 1.42 mg/100 ml of an impurity.What is the level of impurity in % w/w and ppm? Calculate the pH of a buffer system made by dissolving 1.2 g of acetic acid and 0.82 g ofsodium acetate in 500 ml of distilled water (pKa of acetic acid = 4.7)
A 300mg sample containing Na2CO3, NaHCO3 and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1M HCl. The titration required 24.41 mL to reach the phenolphthalein endpoint. And an additional 8.67mL to reach the methyl red end point. Determine the composition of the sample and calculate the percent of each titrated component.
A 2.1562 g sample that may contain NaOH, NaHCO3 and Na2CO3 alone or in compatible mixtures reqıires 31.2 ml of 0.1082 M HCl for titration to the phenolphthalein end point and additional 52.4 ml of the same acid to bromocresol green end point. Calculate the percentages of compound(s) in the sample (M. Mass of NaOH:40 g/mol, M. Mass of NaHCO3: 84.01 g/mol, M. Mass of Na2CO3: 105.99 g/mol)?