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- if we use KMnO4 and H3Po4 and MnSO4 for tritation of fecl3 and calculation of. Fe2+ what suitable ratio for tritationA 0.1017 g sample of KBrO3 (MM=166.1) was dissolved in dilute HCI and treated with an unmeasured excess of Kl. The liberated iodine required 39.75 mL of Na₂S₂O3. Calculate the molar concentration of sodium thiosulfate. 0.2561 M 0.08512 M 0.09242 M 0.1041 MWhy 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
- How does the doubly labeled water method depend on the existence of isotopic equilibrium between the oxygen in H2O and that in CO2?Refering to the image attached (Winkler method), what is the function of sodium thiosulphate and why do we need to add in the solution until it turns into pale yellow colour?In inorganic chemistry we learned about hard/soft acid/base. What is the best way to understand the difference between these terms? And using hard/soft acid/base arguments determine: 1.) rank of the order of reactivity of Pt2+ with NH3 and F- and Ph3P and why? 2.) does CO react more strongly with Fe2+ or Fe3+ and why?
- If Vsu= Vorg, how many times should the extraction process be repeated in order for 1 g of substance with KD= 2.25 to pass 90.5% to the organic phase?A 1.000-g sample containing bromide was dissolved in sufficient water to give 100.0 mL. A 50.00 mL aliquot was measured and after acidification, silver nitrate was introduced to precipitate AgBr, which was filtered, washed, and then dissolved in an ammoniacal solution of potassium tetracyanonickelate(II): Ni(CN)42- + 2AgBr(s) → 2Ag(CN)2- + Ni2+ + 2Br-50.00 mL remaining solution was analyzed for its Br- content by potentiometry using a metallic electrode of the second kind. a) Write the cell notation of the potentiometric set-up with SCE as the reference electrode. b) Write the Nernst equation that describes the indicator electrode set-up. Ecell recorded in running the solution using the potentiometric set-up was Ecell = 0.0286 V. (E0Ag/AgBr = 0.095 V) c) Compute for Eind. d) Compute pBr in the 50.00 mL aliquot. e) Compute for % NaBr ( in the potentiometric technique).Explain what happened to the salt (the inorganic impurity) during the extraction process. Where does it go and why?
- To determine the percent purity of a sample containing iron(II) ammonium sulfate; Suggest , 2 different methods for iron(II) ion. Explain in detail what errors may occur in the methods. (volhard method, gravimetric analysis, kjeldahl, etc.) Percentage content: 1-100% ; the solution concentrations to be used are 0.01-0.1M; Take the volumes of solution to be used between 1-50 mLA piece of brass weighing 230 mg was dissolved and prepared. Excess KI was added and the liberated I2 required 24.9 mL of 0.0947 M Na2 S2O3 to reach the starch end point. What is % Cu (63.5) in the sample.What is the purpose of adding CaCO3 or NaHCO3 in the Mohr Method determination of chloride?