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A 1.00 L solution contains 15.52 g of nitrous acid, HNO2. What mass of sodium nitrite, NaNO2, should be added to it to make a buffer with a pH of 2.96? Ka (HNO2) = 4.0 × 10-4.
The protein concentration of a 1/10 dilution of a BSA sample was measured and found to be 0.45 mg/mL. Explain what is the protein concentration of the original concentrated BSA solution
Draw one energy diagram showing both reaction pathways & label all transition states, intermediates and products as well as activation energies.
A 50% by mole solution of ethanol and water is prepared. Both their partial volumes do not equal their pure partial volumes. The total volume is observable, however, there are two unknowns. Using an approximation how can two partial volumes be mea..
1. The sulfur dioxide present in air is responsible for the "acid rain" phenomenon. One can calculate its concentration by titrating against a standard permanganate solution as follows:
For the following hypothetical elementary step reaction at equilibrium: A in equilibrium with B, and from the ARrhenius equation k= A e^(-Ea/RT), derive the equation : Ln(K1/K2)= delta H/R(1/T2 - 1/T1) in any one of it's forms.
Problem- Explain what might be the difficulties, if any using the esterification experimental procedure with 88% Formic acid and 95% Ethanol to prepare: hint check the physical properties of the reagents and products
Suppose you have just added 200.0 ml of a solution containing 0.5000 moles of acetic acid per liter to 100.0 ml of 0.5000 M NaOH. What is the final pH? The Ka of acetic acid is 1.77 x 10^-5
A certain amount of gas at 28.0 degrees C and at a pressure of .900 atm is contained in a glass vessel. suppose that the vessel can withstand a pressure of 2.05 atm. how high can you raise the temperature of the gas without bursting the vessel
Consider 2 Al + 6 HCl → 2 AlCl3 + 3 H2 , the reaction of Al with HCl to produce hydrogen gas. This reaction has a yield of 82.5 percent. How much HCl are needed to produce 14.0 L of H2 at 351 K and 1.11 atm
Describe how a specific gene can be identified from a gene library.
Determine the correct stoichiometry for the relevent reaction first (i.e. that NiCl2 ? Ni2+ + 2Cl?). Then it is a simple plug into the Nernst equation problem.
What does the volume correction constant (b) in the van der Waals equation represent? Why is b for helium small (b = 0.0238 L /?mol) compared to b for decane (C10H22, b = 0.3043).
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