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-  Time remaining: 00 :09 :31 Chemistry DETERMINATION OF BIOLOGICAL OXYGEN DEMAND USING THE MODIFIED WINKLER METHOD GUIDE QUESTIONS: 1. What are the pertinent chemical equations in the standardization of sodium thiosulfate solution? 2. Explain the reason for the addition of H2SO4 and excess KI. 3. What is the effect of adding the acid before KI? 4. Present the pertinent chemical equations involved in the analysis. 5. Explain the stepwise production of titratable 12 from dissolved Oz in the sample. 6. Explain why the reagents are added in the specific sequence described in the experiment. 7. Explain the would-be effects (if any) of the following considerations: a. Water sample was made to stand overnight before analysis b. MnSO4 was added and the solution was made to stand overnight before the analysis 8. What are the possible sources of errors and their effect on the calculated parameters?Lactated Ringer’s/5% Dextrose solution contains: 6 g/L of Sodium Chloride (NaCl MW 58.5) 3.1 g/L of Sodium Lactate (C3H5O3Na MW 112) 0.3g/L of Potassium Chloride (KCl MW 74.5) 0.2g/L of Calcium Chloride (CaCl2•2H2O MW 147) 50g/L of Dextrose (C6H12O6 MW 180) You receive an order to increase the Potassium ion concentration to 0.045 mEq/mL. How many mL of 14.9% Potassium chloride injection should be added to 1L of the above solution to increase the potassium ion concentration to 0.045 mEq/mL ____________________mL 14.9% KCl injectionEthanol reacts with chlorine in a continuous reactor according to the equationC2H6 + Cl2 → C2H5Cl + HClA portion of the monochloroethane reacts with chlorine in an undesired side reaction according to the equationC2H5Cl + Cl2 → C2H4Cl2 + HClThe conversion of ethane is 13%, the selectivity of monochloroethane relative to dichloroethane is 13.3 and all the chlorine is consumed. Calculate the moles of each species in the outflow per 100 moles of monochloroethane produced.
- 5.00 mL of stock solution is diluted to 25.00 mL, producing solution ALPHA. 10.00 mL of solution ALPHA is diluted to 25.00 mL, resulting in solution BETA. 10.00 mL of solution BETA is then diluted to 25.00 mL, producing solution GAMMA. dilution factor for ALPHA from stock solution = 0.167 dilution factor for BETA from ALPHA solution = 0.0476 part c and d?What is ΔHsys for a reaction at 16.9 °C with ΔSsurr = -159 J mol-1 K-1 ? Express your answer in kJ mol-1 to at least two significant figures. (Please type answer no write by hend)Ammonia is burned to form nitric oxide and water: 4 NH3 + 502 4NO + 6H20 The fractional conversion of oxygen is 0.5. The inlet molar flow rate is 5 mol/h of NH3 and 5 mol/h of oxygen. Calculate the exit component molar flow rates using the three methods: a. Extent of reaction method b. Atomic balance approach c. Molecular species balance approach
- Ali has measured the oxidative stability of palm oil sample under accelerated storage condition at 60*C for 6 days The following data were recorded for the peroxide value and p anisidine value of the palm oil after 5 days of storage time: Sample weight 1.0030 g Concentration of NazSzO3 = 0.001 N Volume of NazSzO3 titrated for sample solution = 1.35 ml Volume of NazSzO3 titrated for blank solution 0.20 ml Absorbance for sample solution = 0.907 Absorbance for blank solution 0.203 Calculate: i) peroxide value ii) p-anisidine value iii) TOTOX valueConsider the following simultaneous reactions: N2 + 3H2 → 2NH3(a) H2 + CO2 → CO + H2O (b) 550 mols are fed into the reactor, initially containing 67.4% H2, 21.3% N2 and the remainder CO2. The mixture at the outlet has 16% NH3 and 5% H2O (molar percentages). a- Calculate the degrees of advancement of reactions (a) and (b).If 5 µM enzyme was used to obtain the data in the summary plot below, V-max = ________________ µM sec-1 and Km = ____________ µM for this enzyme (Enter numeric values to the nearest integer; Do NOT write units.)
- Vitamin C Analysis, a student accidentally puts 1.0 g of sodium bicarbonate (NaHCO3) solid into the vitamin sample solution for trial #1 instead of 0.5 g as the procedure instructs. How does this procedural change impact the calculated milligrams of ascorbic acid in the sample?A chemist received different mixtures for analysis with the statement that they contained NaOH, NaHCO3, Na2CO3, or compatible mixtures of these substances, together with inert material. From the data given, identify the respective materials, and calculate the percentage of each component. 1.000g samples and 0.2500N HCl were used in all cases. (A) For Sample W: With PP, 24.32ml was used. A duplicate sample required 48.64ml with MO. (B). For Sample X: The addition of PP caused no color change. With MO, 38.47ml of the acid was required. (C). For Sample Y: To cause a color change in the cold with PP, 15.29ml of the acid was necessary, and an additional 33.19ml was required for complete neutralization. (D) For Sample Z: The sample was titrated with acid until the pink of PP disappeared; this process required 39.96ml. On adding an excess of the acid, boiling, and titrating back with alkali, it was found that the alkali was exactly equivalent to the excess acid added.Time on hotplate (min) 60, 66, 68, 75, 85, 95, Mass of ZnCO3 + Filter paper (g) 3.7123, 2.7035, 2.6574, 2.5213, 2.3548, 2.239 Use the following data table and steps a-d below to calculate the concentration of the zinc carbonate. The mass of the filter paper alone (no ZnCO3) was 1.3457 g. The ZnNO3 solution (10.00 mL) was mixed with 15.00 mL of the 1.00 M Na2CO3. Calculate the mass of zinc carbonate formed. How many moles of zinc carbonate formed? Calculate the moles of zinc in the zinc nitrate solution used. Calculate the concentration of the zinc in the zinc nitrate solution.