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Ammonia is a gas whose smell we detect in manure as well as in some cleaning solutions, among other things. If the concentration of this noxious gas can be controlled by regulating the pH of the water because only the non-protonated form is volatile.The pKa for the preceding reaction is 9.3. Explain what fraction of the total nitrogen (NH4+ + NH3) is in the volatile form at pH 9.0?
What is the titer of the iodine solution of the .1000g sample of pure ascorbic acid 23.52 ml I2.
calculate the energy levels of the pi-network in octatetaene c8h10 using the particle in the box model. to calculate
A 1.95 gram sample of sodium sulfate hydrate lost 0.756 gram of water when heated to constant mass. What is the formula of the hydrate?
Calculate the equilibrium constant for the reaction. The standard enthalpy change delta H, for a strong acid-strong base reaction is -57.8k J. Determine the standard entropy change delta S for the reaction at 25 degrees C.
plaster of paris csso4 x xh2o is a fractional hydrate that is one water molecule attaches to more than one formula
mass mol atoms moles mol mass moles atoms g mol atoms moles how many atoms are in 1 g of what is the mass of 1 the
The isothermal compressibility of graphite is 1.56 × 10-7 bar-1. At what pressure is density equal to density of diamond?
A mercury nanometer contains 2 g of Ar. A burner heats it to P-ext. at 760 torr. What is the Temperature of the gas in the bulb when the total volume is 3 L and H=76mm?
When silver crystallizes, it forms face-centered cubic cells. The unit cell edge length is 408.7 pm. Calculate the density of silver. (Enter answer to three significant figures.)
Write the chemical equation for the ionization of each of the following weak acids in water. (Some are polyprotic acids; for these write only the equation for the first step in the ionization.
Calculate the volume and mass required to make 0.1m solutions of your assigned acid (HNO3) and conjugate base
Calculate the hypothetical retention times for caffine and aspartame if their retention factors were reduced by 28.0 %. Assume the mobile phase retention time (tm= 29.7 s) remains constant.
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