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what is the pH of a Tris buffer (pka 8.1) prepared by adding 20 mL of 1M HCl to 100mL of a solution of 0.3M Tris? Explain your results and show your work.
A sample of 1.42 g of Helium and an unweighed quantity of Oxygen are mixed in a flask at room temperature. The partial pressure of Helium is 42.5 torr and of oxygen is 158 torr.
the system is not at equilibrium and will shift to the right to achieve an equilibrium state. not at equilibrium and will shift to the left to achieve an equilibrium state. at equilibrium. not at equilibrium and will remain in an unequilibrated sta..
Then 2.00 mL of solution containing 0.0156 M dopamine was mixed with 90.0 mL of unknown, and the mixture was diluted to 100.0 mL in volumetric flask. The signal from the new solution was 58.4 nA. What is the dopamine concentration in the unknown s..
What is the pH of a solution that contains three parts of acetic acid and one part sodium acetate?
The equation for the combustion of acetone is: 2 C3H6O + 8 O2 ---> 6 H2O + 6 CO2 + 852.6 kcal How much heat will be given off if 0.87 mol of acetone is completely burned?
Suppose the reaction Ca3(PO4)2 + 3H2SO4 ------ > 3CaSO4 + 2H3PO4 is carried out starting with 103 g of Ca3(PO4)2 and 33.7 g of H2SO4. How much phosphoric acid (H3PO4) will be produced?
Consider the coordination of Cu2+ by the tridentate iminodiacetate ligand . When the monoprotonated form, , abbreviated HA , is added to an aqueous solution of Cu2+,
The amount of nitrogen in an organic substance can be determined by an analytical method, called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammoinia.
The emitted wavelengths of an element can be related to the frequency and energy of emission. The emissions from the hydrogen atom were modeled using the Rydberg equation, which Niels Bohr used to develop the Bohr model of the atom.
A sample of nitrogen gas occupies a volume of 3.87 liters at 52.8 oC and 2.11 atm. What will the new temperature (in °C) when the volume increases to 4.55 liters and the pressure remains constant?
Integrals for some of the resonances in the 1H NMR spectrum are higher than they should be due to the shear number of hydrogens in this compound
every ten rounds an amplification of approximately 1000-fold. So, to get an amplification of 4.000 one would do 2 + 10 = 12 rounds . This, of course, assumes high yields for each step.
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