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A mixture consisting of 30ml of waste and 270ml of seeded dilution water has an initial DO of 8.55mg/l; after 5 day, it has a final DO of 2.40 mg/l. Another bottle containing just the seeded dilution water has an initial DO of 8.75 mg/l, and a final DO of 8.53mg/l. Find the 5 day BOD.
Calculate the concentrations of ALL species in a 0.740 M Na2SO3 solution. The ionization constants for sulfurous acid are Ka1
The organic compound called aluminon is used as a reagent to test for the presence of the aluminum ion in aqueous solution
Magnesium hydroxide, the active ingredient in milk of magnesia neutralizes stomach acid , primarily HCL, according to the reaction: Mg (OH)2 (aq) + 2 HCL(aq) ---> 2 H2 O (l) + Mg(OH)2(aq).
The nitrate concentration in an industrial effluent is determined using a nitrate ion selective electrode. Standards and samples are diluted 20-fold with 0.100 K2SO4 to maintain consatnt ionic strength.
A close chemical relative of the banned insecticide DDT is methoxychlor (C16H15Cl3O2). Methoxychlor is currently used as a home insecticide. Calculate the mass percent of oxygen in methoxychlor.
what wind flow rate entering the canyon would produce a pollutant concentration greater than 0.0025 gmol/ft^3 in the air coming out of the canyon?
Predict the type of bond (ionic, covalent, or polar covalent) one would expect to form for each bond.
What mass of sucrose should be combined with 479 of water to make a solution with an osmotic pressure of 8.00 at 315 ? (Assume the density of the solution to be equal to the density of the solvent.)
what volume of dry H2 gas would theoretically be produced if it is measured at 20 degrees Celcius and 785 mmHg?
Chlorine gas can be produced commercially by passing an electric current through a concentrated solution of sodium chloride (brine).
Mg +2HCl-> MgCl2 + H2 what volume of Hydrogen at STP is produced from the reaction of 50.0g and the equivalent of 75 g of HCl? Also, How much of the excess reagent is left over?
Draw a Lewis structure of BF that satisfies the octet rule for both atoms
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