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Ammonia is a gas whose smell we detect in manure, cleaning products, and other things. The concentration of this noxious gas can be controlled by regulating the pH of the water because only the non-protonated form, NH3, is volatile. The pKa for the reaction shown below is 9.3.
NH4^+ <=>NH3+H^+
What fraction of the total ammonia-nitrogen (NH3 + NH4+) is in the volatile form at pH = 9.0?
Break Even Stripping Ratio (BESR), Given an underground total mining cost of $8.85 per tonne, surface mining costs of $2.95 per tonne of ore, and surface mining stripping costs of $1.75 per tonne of waste
What do you understand by the term durability? Compared to other considerations, how much importance should be given to durability in the design and construction of concrete structures?
Briefly explain the purpose of the International Space Station, and list the name of all space agencies involved in building and operating it.
The dissolved oxygen of sample water is 1.5 mg/L. At 25 C, the dissolved oxygen of the dilution water is 8.25 mg/L. You are told the BOD5 of the sample is 130 mg/L. You have a target final dissolved oxygen of 3.0 mg/L (give yourself some leeway).
Rod AB is bent into the shape of a circular arc and is lodged between two pegs D and E. It supports a load P at end B. Neglecting friction and the weight of the rod, determine the distance c corresponding to equilibrium when a = 43mm and R = 143mm..
Describe some of the benefits of physical models and mock-ups. What data are required to measure the following cost-effectiveness, system effectiveness, operational availability, and life-cycle cost?
Given an 18-in. concrete conduit with a roughness coefficient of n = 0.013, s = 0.02, and a discharge capacity of 15 cfs, what diameter pipe is required to triple the capacity?
An ethanol plant distills alcohol from corn. The distiller processes 2.0 t/h of feed containing 15% alcohol and 82% water; the rest is inert material. The bottoms (waste) produced is 85% of feed and contains 94% water, 3.5% alcohol, and 2.5% inert..
A person produces about 0.17 pounds of BOD per day in fecal waste. What is the population equivalent of the wastewater flow Based on this calculated population, what would the average daily wastewater production be per person
At a section in a beam the tensile stress due to bending is 70 N/mm 2 and there is a shear stress of 25 N/mm 2 . Determine from first principles, the magnitude and direction of the principal stresses and calculate the max shear stress.
Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?
The forces F1, F2, and F3, all of which act on point A of the bracket, arespecified in three different ways. Determine the x and y scalar components of each of the three forces.
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