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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)?
what are the main sources of error in a calorimetry experiement. describe at least three errors.
Buffering capacity You want a solution that will buffer the addition of either 10 micromoles of acid or 10 micromoles of base. Total buffer concentration is equal to the concentration of the acid plus the concentration of salt of the acid
What is the estimated temperature of the object using the above approximate prescription? What is the percent error?
The atmospheric pressur on Pluto is 3 microbars. Express this pressure in bars, kPa, atm, and torr.
A student adds 8.10 mL of a 0.490 M HCl solution to the beaker. How much will the pH change? The PKa of acetic acid is 4.760.
Describe 3 types of marine life and how they are affected by the increase of acidity in the oceans.
Compute the volume of the tank if the total pressure of the mixture is 44.08 psi at 86°F. What is the partial pressure of each constituent and the average molecular weight of the mixture
Given that the partial pressure is 7.0x10^-4 atm, what is the pH of water at equilibrium with the atmosphere
Lightning from thunderstorms strike the Earth 100 times each second. 2400 deaths have been caused by lightning strikes over the past 25 years. How many strikes occur before a death occurs
How many kilograms of acetic acid needs to dissolve 94 grams of potassium chloride if the freezing point changed 19.6 degrees celcius?
Assuming levels of atmospheric CO2 are 390 ppm CO2, what is the pH of rainwater in equilibrium with the atmosphere for the pre-industrial atmospheric CO2 concentration of 280 ppm,v.
Calculate the 1)mls of 100mM of NaOH or HCl 2) grams of disodium phosphate 3) and the mls of water required to make a 200mM phosphate buffer at pH 6.85
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