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Q: 1. Illustrate/draw the reaction involved in the Wijs titration
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1. What are the scientifically proven bioactivity of VCO that is beneficial to human health?
2. Discuss the advantage and disadvantage of Wijs method of iodine value determination. What non-titrimetric method can be used to determine the iodine value of edible oil? Discuss its basic principles and general methods involved.
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- 1. Illustrate/draw the reaction involved in the Wijs titration 2. What are the scientifically proven bioactivity of VCO that is beneficial to human health? 3. Discuss the advantage and disadvantage of Wijs method of iodine value determination. What non-titrimetric method can be used to determine the iodine value of edible oil? Discuss its basic principles and general methods involved.Discuss the advantage and disadvantage of Wijs method of iodine value determination. What non-titrimetric method can be used to determine the iodine value of edible oil? Discuss its basic principles and general methods involved.Why alkali is added to the nitrification tank？ A. to provide electron donors B. to provide alkalinity for the nitrification reaction C. to acidify the reaction solution D. to provide nutrients for the nitrifier bacteria
- a) Which ion, Pt(II) or Mn(II), is more likely to form a sulfide in the presence of H2S in water. b) Rationalize your answer with the trends in hard and soft character. c) Give a balance chemical equation from your reaction.Around 15 g of Ba(NO3)2 can be dissolved in water. Calculate from that the Ksp for Ba(NO3)2What is the dominant iron species in water samples ? What environmental factors may have contributed. why is it necesseyy to to investigate Fe3+ concentration and total Fe concentration dpeedtaely ? Why do we need to do the sample to determine total Fe concentration ? And how did then determine Fe2+ concentration?
- How does the hydride generation method of sample introduction improve thesensitivity of some elements?(i) How does O3react with lead sulphide? Write chemical equation.(ii) What happens when SO2is passed in acidified KMnO4solution?(iii) SO2 behaves with lime water similar to CO2.A 25.00-mL sample of a household cleaning solution was diluted to 250.0 mL in a volumetric flask. A 50.00-mL aliquot of this solution required 41.27 mL of 0.1943 M HCl to reach a bromocresol green end point. Calculate the mass/volume percentage of NH3 in the sample. (Assume that all the alkalinity results from the ammonia.)
- A 0.7352g sample of ore containing Fe3+, Al3+ and Sr2+ was dissolved and made up to 500.00 mL. The analysis of metals was performed by a chemistry using complexation volumetry. Initially, an aliquot of 50.00 mL had its pH adjusted to 1.0 and titrated with a standard solution of EDTA 0.02145 mol/L, requiring 6.95 mL to reach the end point. Subsequently, another 25.00 mL aliquot was buffered at pH=5 and titrated with the same EDTA solution, requiring 6.24 mL to reach the end point. Finally, a third aliquot of 25.00 mL was titrated at pH=11, requiring 11.10 mL of the same EDTA solution to complete the titration. Determine the percentage of each of the metals in the sample Given the molar masses: Fe=55.845 g/mol; Al=26.982 g/mol and Sr=87.620 g/mol.1. How is complete precipitation assured in the Group III Cations? 2. In the confirmatory test of Magnesium ion, why is it necessary to heat the centrifugate in water bath for 5 minutes? 3. If Magnesium hydroxide is a white gelatinous precipitate, why is the confirmatory result indicated a blue precipitate?What is the charge balance equation of PbCO3?