Prepare a buffer solution
A student is asked to prepare a buffer solution at pH = 8.60, using one of the following weak acids: HA (Ka = 2.7 x10-3), HB (Ka = 4.4 x 10-6), HC(Ka = 2.6 x 10-9). Which acid is best forthis buffer and why?
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One pound-mass of water at 600F expands against a piston in a cylinder until it reaches an ambient pressure of 14.7psi, at which point the water has a quality of 90%. What was the initial pressure in the cylinder?
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A particle of charge +3.0 x 10-8 is in a unifrom electric field directed to the left. It is released from rest and moves a distance of 5.0 cm and its kinetic energy is increased by +4.5 x 10-4 J. a) What is the work fone by the electric force? unit
A student is asked to prepare a buffer solution at pH = 8.60, using one of the following weak acids: HA (Ka = 2.7 x10-3), HB (Ka = 4.4 x 10-6), HC(Ka = 2.6 x 10-9). Which acid is best for this buffer and why?
The convection environment is at 20oC with h=50 W/m2oC. Calculate the total heat lost from the finned-tube arrangement over the 1.0-m length.
In terms of kinetic molecular theory, explain why pumping air into a collapsed soccer ball causes the ball to increase in size and become rigid.
In a Fourth of July celebration, a firecracker is launched from ground level with an initial velocity of 28.6 at 39.1 from the vertical.
How much heat must be transferred from the energy-source to increase the entropy of the energy-sink by 20 kJ/K?
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