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Ammonium (NH4+) is a weak acid with a pKa of 9.26. The dissociation is: NH+4 <--> NH3 + H+. Calculate the mass of ammonium added to 1 L of water in order to obtain a pH of 4 at equilibrium.
A discharge of 2,200 ft^3/sec flows in a trapezoidal channel at a normal depth of 8.0 ft. The channel has a slope of 0.01, a 12-ft bottom width, and side slopes of 1:1 (H:V). Determine the manning coefficient of channel roughness
What is the corresponding horizontal distance between the points - The slop distance 156.777 from one poin to another at rate of+1.5%
Section 604 of the act lists the phase-out of production of substances that deplete the ozone layer. What is the last year that carbon tetrachloride can be produced
Processing begins when the lane reaches capacity, what is the uniform deterministic arrival rate if the vehicle queue is cleared in 35 minutes after vehicles begin to arrive (in veh/min.)?
A model of a submarine, at 1:15 scale, is to be tested at 0.8 ft/s in a wind tunnel at standard at mospheric pressure, while the prototype will be operated in seawater. Both the air and water are at 10 C (50 F).
A consolidated-drained triaxial shear test on a normally consolidated clay yielded a drained friction angle of 28 degrees. If the confining pressure during the test was 15 psi, what was the major principal stress at failure.
Calculate the moments M_A and M_B about point A for the forces applied at points A and B. Then, determine the resulting couple moment M_R. Assume that a positive moment produces a counterclockwise rotation whereas a negative moment produces a cloc..
A hybrid car has a initial cost of $70,000 is to be depreciated by the straight-line method over a six years. The asset will a salvage value of $10,000. According to the straight line method, the book value at the end of year 3 is
what policies were implemented during and after WW1,WW2,Cold war?
water flows through a horizontal plastic pipe with a diamter of .2 m at a velocity of 10 cm/s. determine the pressure drop per meter of pipe using the Moody chart.
The first pipe of 0.4-m diameter is 500 m long, the second pipe 600 m long, size 0.3 m, and the last pipe is 500 m long of diameter 0.2 m. If the elevation difference between two reservoirs is 30 m, calculate equivalent pipe size and flow in the p..
The shape below has a cut along the entire length of the member thus making it an open section. The uniform thickness is 0.125in. Determine the maximum shear stress for the shape. Compare the stress for this open shape to a shape without a cut.
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