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A BOD test is run using 100 mL of treated wastewater mixed with 200 mL of pure water. The initial DO of the mix is 9.0 mg/L. After 5 days, the DO is 4.0 mg/L. After a long period of time, the DO is 2.0 mg/L, and it no longer seems to be dropping. Assume nitrification has been inhibited so the only BOD being measured is carbonaceous. What is the reaction rate constant (k) for this waste (in 1/d)?
Why does the pink color of phenolphthalein fade away and is soda pop acidic. Why
A dioxin-contaminated water source contains 0.081% dioxin by mass. How much dioxin is present in 4.2 L of this water (Assume that the density of the solution is 1.01 g/mL.)
If 22 mL of 5.8 M H_2SO_4 was spilled, what is the minimum mass of NaHCO_3 that must be added to the spill to neutralize the acid.
In order to neutralize a 2M HCL solution you could use a 2M NaOH solution. What will be the difference(if any) if you would use a 6M NaOH solution instead
A saturated solution of Ag2CrO4 prepared by dissolving solid Ag2CrO4 in water has [CrO4]= 6.5x10^-5M. Calculate Ksp for Ag2CrO4.
What is molality of a 1.22 M solution of sugar (C12H22O11)? The density of the solution is 1.12 grams/ml 2- Which of the following in each pair with be more soluble in water?
In the reaction BaCO3 + 2HNO3 -> Ba(NO3)2+CO2+H2O, what mass of Ba(NO3)2 can be formed by combining 55g BaCO3 and 26g HNO3?
The pressure is changed to 8.75 atm and the gas is cooled to 15 C. Calculate the new volume of the gas using the ideal gas equation.
What is the mole fraction of ethanol in this solution. Sdduming ideal-solution behavior, what is the vapor pressure of the solution at 63.5 C. What is the mole fraction of ethanol in the vapor above the solution
Offer a reasonable explanation to account for the unequal ratio attained (2% of one isomer and 98% of the other isomer) in the reaction of BH3 (and the solvent diglyme) with 2-methyl-2-butene.
At what pressure does the mean free path of argon at 25 C become comparable to the diameter of a spherical vessel of volume 1.0 dm^3 that contains it? Take ? =0.36nm^2.
if 2.67 mL of 0.205 M KOH is required to completely neutralize 25.0mL of a CH3COOH solution, what is the molarity of the acetic acid solution?
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