In a redox titration involving potassium permangante with oxalic acid, What is the purpose of the 3 M H2SO4 solution? What is the purpose of the manganese (II) sulfate? Why is it necessary to titrate slowly in this experiment?
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In a redox titration involving potassium permangante with oxalic acid,
What is the purpose of the 3 M H2SO4 solution? What is the purpose of the manganese (II) sulfate?
Why is it necessary to titrate slowly in this experiment?
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- What does it mean to standardize the KMnO4 solution? In the titration, which substance is reduced and oxidized? What is the mole ratio of MnO4-/C2O42- in the chemical reaction in this experiment? What is the purpose of the 3 M H2SO4 solution? What is the purpose of the manganese (II) sulfate? Why is it necessary to titrate slowly in this experiment?1. Why are Ce4+solutions never used for the titration of reductants in basic solutions?the MOST appropriate glassware to be used in transferring a 1.000 M Na2CO3 primary standard solution from a volumetric flask to the Erlenmeyer flask for titration?
- Does the cell voltage increase or decrease when 5 mL of 6 MHCl was added to the solution containing NH3? Explain why.In the following experiment, you will titrate 2.00 mL of 0.0100 M KMnO4 in base with 0.0200 M NaHSO3. Using your balanced redox equation in base from question 3 above, calculate the volume of titrant NaHSO3 you expect to require for a complete reaction. Balanced reaction: 2MnO4^1- + HSO3^1- +3OH^1- <=> 2MnO4^2- + SO4^2- + 2H2OWhich is NOT a commonly used Reducing agent in converting PhNO2 to PhNH2? SnCl2 in concentrated HCl LiAlH4 Sn in dilute HCl H2, Pt
- 1. What are some precautions that should be observed when collecting samples for DO determination, to ensure the amount of oxygen in the sample is representative of the DO at the site? 2. The standard Winkler method uses sodium iodide and sodium azide to be added at the same time as sodium hydroxide. What is the purpose of sodium azide? 3. Chlorinated tap water contains both chlorine (Cl2) and hypochlorite (OCl-) does the presence of these species affect DO results? Write equations to represent their individual interactions. 4. What effect would nitrate (NO2-), a common constituent of polluted water, have on DO results? Write a balanced equation for its interaction. 5. What is meant by seawater intrusion in drinking water supplies? How does this happen? What are some consequences of these phenomena?For breakfast, the nihilistic Rick Sanchez ate 100 g of cereal mixed with 20 g of milk. A 1.500 g sample of the same cereal was analyzed using the Kjeldahl method, and the liberated NH3 was distilled into 50 mL of a 0.0227 M HCl solution, and back-titrated with 2.85 mL of 0.0112 M NaOH solution. A 1.100 g sample of milk was also analyzed, and the liberated NH3 was distilled into 55 mL of a 0.0234 M HCl solution, and back-titrated with a 3.10 mL of 0.0121 M NaOH. Use the values: MM N=14.07 g/mol. meat= 6.25 dairy= 6.38 cereal= 5.70 What is the % protein in the cereal sample? What is the % protein in the milk sample?For breakfast, the nihilistic Rick Sanchez ate 100 g of cereal mixed with 20 g of milk. A 1.500 g sample of the same cereal was analyzed using the Kjeldahl method, and the liberated NH3 was distilled into 50 mL of a 0.0227 M HCl solution, and back-titrated with 2.85 mL of 0.0112 M NaOH solution. A 1.100 g sample of milk was also analyzed, and the liberated NH3 was distilled into 55 mL of a 0.0234 M HCl solution, and back-titrated with a 3.10 mL of 0.0121 M NaOH. Use the values: MM N=14.07 g/mol. meat= 6.25 dairy= 6.38 cereal= 5.70 1. What is the % protein in the cereal sample? a. 5.90% protein b. 10.21% protein c. 11.80% protein d. 20.42% protein 2. What is the % protein in the milk sample? a. 5.90% protein b. 10.21% protein c. 11.80% protein d. 20.42% protein 3. How many grams of protein did Rick consume over-all? a. 3.749 g b. 7.942 g c. 5.901 g d. 10.21 g
- Calculate the activity value of Na ion in a solution containing 0.0075 M MgCl2 and 0.015 M Na2SO4.A 3.25 g sample of an iron-containing mineral was dissolved in an acid medium and calibrated to 500 mL. A 25.00 mL aliquot was titrated with 0.0025 M KMnO4 spending a volume of 9.32 mL. Subsequently, a 25.00 mL aliquot was passed through a Walden reducer to later titrate it with the same permanganate solution, using a volume of 14.15 mL for the titration. Determine the percentage of Fe(III) in the sample and report it as % Fe2O3Why are the solutions all performed in the presence of HNO3 rather than pure water? Hint: consider how a strong acid would affect the types of anions present and then think about the solubility of iron (III) salts.
