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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?
If a single deposit of $15,000 is invested at 2.75% yearly interest, what equal year-end withdrawls can be made each year for 10 years, leaving nothing in the fund after the 10th withdrawl
Calculate the precentage of carbon hydrogen and oxygen in ethanoic acid.
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?
Describe the use of productivity models for estimating land productivity. Provide details about various attributes that can be used and how the model is developed . Examples can be used to demonstrate model workability.
a spot speed study was conducted on a freeway on which the mean speed and the standard deviation were found to be 72 .4 mi/hr and 5.4 mi/hr, respectively. what is the range of the values that would be expected to contain the middle 95 percent of s..
A four year financial project has net cash flows of $20,000; $25,000; $30,000; and $50,000 in the next four years. It will cost $75,000 to implement the project. If required rate of return is 20%, conduct a discounted cashflow calculation
The volume of fill required is 2500 cubic meters. Find the volume of soil that must be excavated from the borrow pit to furnish the required volume of fill. (in cubic meters).
What is the maximum safe speed around the curve? If the speed limit on the roadway is 60mph, what action should be taken by the engineer?
A 4 mgd water treatment planet is being designed for an overflow rate of 0.5 gpm/ft^2. If two circular sedimentation basins will be used at al times, what should be the diameter of each basin
The coefficient of friction between the crate and the floor is µs = 0.4 and µk = 0.3. If P is slowly increased until the crate starts to move and then remains constant, determine using energy methods the speed of the crate after moving 2 m.
A pipeline terminates in a nozzle of outlet diameter = 0.15 m. The free jet from the nozzle is deflected through 120º by a vane as shown. Water flow rate through this pipe is 0.25 m3/s. Ignoring friction, find the force exerted by the jet on ..
What should TAC , TAB and the acute angle ? between TAB and the vertical to minimize the tension TAB ? Take o and W = 1,000 N. Hint: Consider various possible force triangles and decide on inspection how to minimize TAB.
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