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- What constitutes a 'reference material', and why does its utilization play a criticalrole in the chemical analysis of food products? Provide examples.What is the actual or real-life application of precipitation gravimetric analysis? Include the specific methodology.A chemist received a radioactive sample that is suspected to contain U, 23U and other elements. The authority wants to know the distribution, qualitative and quantitative composition of the sample. Propose with justifications, ONE Surface analysis technique that can be performed on this sample.
- Compare and contrast an anticipatory standard to a reactionary standard by listing and describing some advantages and disadvantages.Illegal mining affected many rivers with extremely high deposits of heavy metals and particulate matter in the river of America making them unwholesome for drinking. With the help of your knowledge on analytical separation and analysis outline suitable analytical protocol that can be employed to recover polluted river bodies and make them wholesome for drinking.Many rivers in Ghana are affected by illegal small-scale mining. Studies have revealed extremely high deposits of heavy metals and participate matter in rivers, making them unwholesome for drinking. With your knowledge on analytical separation and analysis, outline a suitable analytical separation protocol that can be employed to recover polluted river bodies and make them wholesome for drinking.
- A sample of an iron ore was prepared for Fe3+ analysis as following: 3.4g of the sample was added anddissolved in acid environment then diluted to 250 mL using volumetric flask. After that, 10 mL of the resultingsolution was transferred by pipet to a 50-mL volumetric flask and continue to be diluted. The scientists foundout that this solution gives the concentration of Fe3+ as 2.3 mg/L. Find the weight percentage of Fe3+ in theoriginal sample.State and explain the principle on which the fully automated analyser operates.Here is a use objective for a chemical analysis to be performed at a drinking water purification plant: “Data and results collected quarterly shall be used to determine whether the concentrations of haloacetates in the treated water demonstrate compliance with the levels set by the Stage 1 Disinfection By-products Rule using Method 552.2” (a specification that sets precision, accuracy, and other requirements). Which one of the following questions best summarizes the meaning of the use objective?(i) Are haloacetate concentrations known within specified precision and accuracy?(ii) Are any haloacetates detectable in the water?(iii) Do any haloacetate concentrations exceed the regulatory limit?
- A test tube contains the following chemical equilibrium: N2O4(g) + 59 kJ ⇌ 2NO2(g). You notice that the colourless contents of the test tube turn brown. Provide two realistic reasons as to why this change would occur in a laboratory setting. Support claims with evidence from course conceptsPotassium dichromate has several industrial applications. To determine the purity of the salt that will be used in different industrial processes, a sample mass equal to 2.660 g was dissolved and quantitatively transferred to a 500.00 mL flask. An aliquot of 25.00 mL of this solution was treated with excess KI and the released iodine was titrated with 0.1000 mol L-1 sodium thiosulfate, spending 27.00 mL. Calculate the purity of the analyzed salt. Data:K = 39.10 O = 16.00 Cr = 52.00 I = 126.9 S = 32.07Write the relevant chemical reaction and mass-balance expression for 0.1 M NaCl.
