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Explain why selectivity in isocratic HPLC system ideally should not depend on eluent composition. (Use thermodynamic derivation to support your explanation).
The weak acid HZ has a ka of 2.55*10^-4. What is the pH of a .075 M HZ? What is the pOH of .045 M HZ?
A beaker with 115 of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 . A student adds 9.00 of a 0.430 solution to the beaker. How much will the pH change? The ..
A first-order reaction has a rate constant of 0.33 y-1. How many years does it take for the concentration of the reactant to decrease from 0.13 M to 0.088 M?
Would it be safer to store a nickell (II) chlorides solution in a lead container or a chromium container?
What is the final pressure in the container if 705 mL of helium gas at 205 mm Hg is compressed to 255 mL?
What is the pressure exerted in the closed end of an apparatus if the atmospheric pressure is 720 torr and the height of the water column is 22.3 cm?
how many milimeters of 0.755 M H2SO4 solution is needed to react with 55.0 mL of 2.50 M KOH solution? Given 2KOH (aq) + H2SO4 (aq) ------ 2H2O (I) + K2SO4
A photon having E = 46.9 keV energy scatters from a free electron inside a metal. What is the maximum energy the electron can gain from the photon
explain why there is a difference in spectrophotometric response during titration before and after the equivalence point by placing the statements below into the appropriate categories.Now, calculate the concentration of apotransferrin present in ..
The compound is composed of 41.39% carbon, 3.47% hydrogen and 55.14% oxygen. The molecular mass is 116.07 g/mol. What is the molecular formula?
What is the equilibrium expression for the following reaction. Please interpret as an equilibrium symbol.
Calculate the Z for the fourth ionization of Ti when it requires 425.6 kJ of energy to ionize 0.185 moles of Ti^3+ to Ti^4+ ( The electron being removed is in the outermost valence orbital of Ti^3+ ground state, therefore n = 3)
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