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Determining the BOD of a water sample,it was found that the DO level was 9.3ppm before incubation and 6.7 ppm after five days of incubation.what is the BOD of this sample?
A 0.351 L solution of 1.41 M oxalic acid (Ka1 = 6.5e-2 and Ka2 = 6.1e-5) is titrated with 1.25 M KOH. What will the pH of the solution be when 0.7008 L of the KOH has been added
The density of the solution is 0.993 g/mL. What is the molarity and molality of acetone in this solution?
A 33.0-g sample of an alloy at 93.0°C is placed into 258 g of water at 22.0°C in an insulated coffee cup. Assume that no heat is absorbed by the cup. If the final temperature of the system is 31.1°C
what would be the concentration in the pond (and outlet stream) after 2 days? Inlet and outlet flows are both 280 m3 per day.
Consider the titration of 50.0 mL of 0.0500 M H2NNH2 (a weak base; Kb = 1.30e-06) with 0.100 M HClO4. Calculate the pH after the following volumes of titrant have been added: (a) 0.0 mL pH = (b) 6.3 mL pH = (c) 12.5 mL pH = (d) 18.8 mL pH = (e) 25..
Determine the volume (in mL) of 0.00437 M cesium hydroxide (CsOH) that must be added to 81.4 mL of 0.0282 M hypochlorous acid (HClO) to yield a pH of 6.70.
Calculate the mass of reagents required to prepare 100 mL of a 275 mM solution of monobasic phosphate and 100 mL of a 275 mM solution of dibasic phosphate, each containing 2.75 mM MgCl2
why was the titration performed by the addition of permanganate solution to oxalate solution and not the other way
Three gases (8.00 rm g of methane, CH_4, 18.0 g of ethane, C_2H_6, and an unknown amount of propane, C_3H_8) were added to the same 10.0 L container.
sample of benzoic acid is burned in a bomb calorimeter at 25 degrees C, and the temperature increases by 3.72 degrees C. What is the calorimeter constant?
element symbols and chemical formulas.1.write chemical formulas for the following compounds.a. ethyl alcohol which
Molecular mass of a sample of 0.299 g of a gas in a 0.220 L bulb under a pressure of 0.757 atm and at a temperature of 250 C
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