If the 5 day BOD of a sample is 300mg/L and the ultimate BOD at the same temperature is 480mg/L, at what rate the sample is oxidized?
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- In a titration of dilute sulfuric acid, H2SO4, with sodium hydroxide, NaOH, how many milliliters (mL) of 0.2025 M NaOH is required to neutralize a 20.00-mL sample of 0.425 M H2SO4 according to the following equation? H2SO(aq) + 2NaOH(aq) --> Na2SO4(aq) + 2H2O(l) (A) 10.5 mL (B) 21.0 mL (C) 31.5 mL (D) 42.0 mLWhich type of sample of the same weight will reach EMC fastest in the same RH? Place in the order from fastest to slowest. Fastest = ◆ -> ◆ -> wood powder wood chips wood block ◆ = SlowestJQuestion a) Write down the chemical equations for the reactions that take place in the DO test. b) Discuss the environmental significance of DO. c) Why should DO fixation be performed in the field rather than in the laboratory? Data Sheet Volume of solution for titration = Samples Sample A Sample B (i) (ii) (iii) (i) (ii) (iii) Average Average Titration reading Start End (+0.05mL) (+0.05mL) mL Volume of Na2S2O3 (mL) Dissolved Oxygen (DO)(mg/L)
- Iron pyrite is often called “fool's gold” because it looks like gold (see page 11). Suppose you have a solid that looks like gold, but you believe it to be fool's gold. The sample has a mass of 23.5 g. When the sample is lowered into the water in a graduated cylinder (Study Question 63), the water level rises from 47.5 mL to 52.2 mL. Is the sample fool's gold (d = 5.00 g/cm3) or “real” gold (d = 19.3 g/cm3)?Read the question carefully and give me all right solutions. If you don't know the solution please leave it but don't give me wrong solution. If the initial dissolved oxygen of a 3 mL sample is 7.5 mg/L and after day 5 is 5.5 mg/L, with a k rate determined to be 2 mg/L. what is the BOD5 ? Ultimate BOD ? BOD 2 ? BOD 10? . Create a BOD graph (time vs BOD) .A proximate analysis of a sample of MSW is conducted and the following data is recorded. Calculate the energy content (kcal) of one kilogram of the MSW. Initial sample weight = 3.6 g Sample weight after holding at 105 degrees C = 2.4 g Sample weight after holding at 950 degrees C in a closed crucible = 1.8 g
- In a water sample, the concentrations of 2+ Ca²+, Mg²+ and HсO₂ are 100 mg/L, 36 mg/L and 122 mg/L, respectively. The atomic masses of various elements are: Ca = 40, Mg = 24, H = 1, C = 12,0 = 16 The total hardness and the temporary hardness in the water sample (in mg/L as CaCO3) will be A 400 and 100, respectively. B 400 and 300, respectively. c) 500 and 100, respectively. D 800 and 200, respectively.6 Ydu will obtain 2.0 L of tap water for you water hardness test. The water hardness test uses a precipitation reaction to precipitate the Calcium bicarbonate present out of solution by adding 1.9 g of Ca(OH) represented by the following equation: Ca(HC03|21ag) + Ca(OH)215) > 2CaCOsisi + 2 H20 ml What is the percent yield of CaCO3 produced in the hard water test? (fig. 4)3. Table below shows the concentration of dissolve oxygen for a BOD test, diluted by 100. Time (days) Diluted sample DO (mg/L) 7.95 1 3.75 2 3.45 2.75 2.15 1.8 i. Determine BOD5 Given the deoxygenation rate coefficient of 0.15 day-1, determine the ultimate BOD ii. iii. Based on answer from (i), identify class of the water sample based on INWQS guideline and propose suitable usage the water.
- What is the pH of a buffer made from 0.350 mol of HBrO (Ka = 2.5 × 10⁻⁹) and 0.090 mol of KBrO in 2.0 L of solution?Advection, diffusion, and reaction in a channel Approximately 50 m3 of an agricultural pesticide with an initial concentration of 1.6 × 105 mol/m3 have been spilled into a stream following a train derailment. You have been called in to predict the aqueous concentrations of this pesticide at various points along the stream, and the mass that will be delivered to a lake with critical habitat 70 km downstream. You look up the main component of the pesticide and see that it degrades in water (due to hydrolysis reaction) with a half-life of 1.9 h. The discharge rate of the stream is 75,000 L/min. It has an average depth of 0.3 m and an average width of 1.2 m. a. Calculate the maximum concentration (in mol/L) of the pesticide that will be observed at a town 10 km downstream and at the point where the stream reaches the lake, 70 km downstream. Assume a sheer velocity of 0.40 m/s. b. Plot the concentration of this pesticide entering the town and the lake with time. Care should be taken when…Lake Bonaventure is a lake fed by the Saint Croix River. The Acme smeting company discharges the heavy metal nickel into the lake. The easy way to model the concentration of nickel is to assume the lake is well mixed. It isn’t. The lake has a mean depth of 30m, and during the summer a surface epilimnion of 5m develops, which breaks down for the winter. (no calculations are required to answer the questions below) (A) Given what you know about the hydrology of lakes, what differences in concentration would there be if the smelter discharges at the surface or at a depth of 30m? (B) How would concentrations vary in the lake throughout the year? (C) What if you factor in the fact that the flow of the Saint Croix River is less during the winter?