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An aqueous solution containing 2.0M of AgNO3 is slowly added from a burette to an aqueous solution that holds 0.01M Cl- as well as .01M Br-. Is separation of the two ions by selective precipitation feasible? Assume 10^-5 M as the complete removal of an ion.
Ksp(AgCl) = 1.8e-10
Ksp(AgBr) = 8.5e-17
When X rays of wavelength 0.096 nm are diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.2°. What is the distance between the layers of atoms responsible for the diffraction?
how many years would it take for a 10-gram sample of U-238 to decrease to 2.5 grams?
The pH increased from 5.8, the normal pH of a cigarette , to pH 6.4 by addition of ammonia. How many moles of ammonia are required to produce this pH change per cigarette (volume approx. 5ml)?(Assume that no unprotonated ammonia will exist at pH 6..
A 120 pound woman working in an office consumes about 2200 kcal/day, whereas the same woman climbing a mountain needs 3400 kcal/day.
If a reaction vessel initially contains only CO and NH3 at concentrations of 1.00 M and 2.00 M, respectively, what will the concentration of HCONH2 be at equilibrium?
Explain why chemistry is such an important part of the study of Anatomy and Physiology. Please be sure to include specific examples of important chemical reactions as evidence of chemistry's importance to homeostasis.
The acid-dissociation constant of hydrocyanic acid(HCN) at 25.0C is 4.9x10^-10. What is the pH of a aqueous solution of 0.080M sodium
After allowing the solution to sit for 30 minutes the student determines that the bromide concentration was [Br-]= 0.0012 M. What is the Pb2+ concentration?
oxygen are required to react with 5.62 mol nitrogen to produce dinitrogen trioxide?
A room with dimensions 7.00m by 8.00m by 2.50m is to be filled with pure oxygen at 22.0C and 1.00atm . The molar mass of oxygen
What is the pH at the isoionic point? What is the pH at the isoelectric point? Explain the difference between your answers in (a) and (b), including specifically why one result is larger than the other.
In Horner-Wadsworth-Emmons reaction, a 1,2-disubstituted alkene was produced in which the olefinic protons exhibited at vicinal coupling of 9.0 Hz in the 1H NMR. What is the stoichiometry of the double bond.
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