Assuming that no equilibria other than dissolution are involved, calculate the concentration of all solute species in each of the following solutions of salts in contact with a solution containing a common ion. Show that changes in the initial concentrations of the common ions can be neglected.
(a) TlCl(s) in 1.250 M HCl
(b) PbI2(s) in 0.0355 M CaI2
(c) Ag2CrO4(s) in 0.225 L of a solution containing 0.856 g of K2CrO4
(d) Cd(OH)2(s) in a solution buffered at a pH of 10.995
In: Chemistry
The following reaction has achieved equilibrium. Predict the effect on the formation of phosphorous pentachloride (increase, decrease or no effect) for the stated changes to the system:
PCl5(g)←→PCl3(g)_Cl2(g)
A) The concentration of phosphorous trichloride is increased.
B) The concentration of chlorine is increased.
C) The volume of the container in which the reaction is taking place is suddenly made smaller.
D) The pressure of the system is increased by adding one atmosphere of gaseous nitrogen to the container.
Could you please explain your answers? Thank you!
In: Chemistry
1) Draw the structure of the product formed by addition of vitamin B1 and benzaldehyde.
2) Ammonia adds to carbonyl groups but is ineffective as a catalyst for the benzoin condensation. Explain.
3) Write a balanced oxidation-reduction equation for the oxidation of benzoin by ammonium nitrate (the cupric ion catalysis need not to be considered).
4) In the benzil oxidation the initial blue color changes to gren as the reaction proceeds. Why?
5) In dilantin sodium it is the imide proton that is abstracted rather than the amide proton. Why?
In: Chemistry
1) Draw the structure of the product formed by addition of vitamin B1 and benzaldehyde.
2) Ammonia adds to carbonyl groups but is ineffective as a catalyst for the benzoin condensation. Explain.
3) Write a balanced oxidation-reduction equation for the oxidation of benzoin by ammonium nitrate (the cupric ion catalysis need not to be considered).
4) In the benzil oxidation the initial blue color changes to gren as the reaction proceeds. Why?
5) In dilantin sodium it is the imide proton that is abstracted rather than the amide proton. Why?
In: Chemistry
1. Discuss the implications of the spread and change of species distributions after the retreat of the Pleistocene glaciers for evolutionary changes in species and for the species composition of ecological communities.
2. Describe the major mass extinctions over geological time. When did each occur? What was the most probable cause for each mass extinction event? What is the evidence to support each cause? How does the background rate of extinction over most of geological time compare to our current rate of extinction in present time?
In: Biology
write a one page letter to your loan lender,convincing him on how your facility can pay his money. Tell him what your assisted living facility do,
summarizing your financial needs and discussing any assumptions or limitations of your budget. Be sure to also address any unexpected things that might occur (downturn in the economy, policy or legislative changes to insurance, etc.). This written narrative will be given to the commercial lender in support of your application for the loan.
In: Operations Management
Consider an electron initially moving in the positive x-direction along the negative x-axis with an energy E. At the origin the electron encounters a square barrier; the potential energy U (x) changes abruptly, from ? U(x)=0? for x<0, to U ( x) 1.0eV for 0<x<a. to U(x)=0 for x>a, where the barrier width a=1 nm . Graph the transmittance as a function of energy, for the range 0 <E<5eV . For what values of energy is there a transmission resonance?
In: Physics
Consider the following equilibrium for the exothermic reaction: 2NaHSO3(s) <=> Na2SO3(s) +H2O(g) +SO2(g)
How will the equilibrium shift when each of the following changes are made separately? Answer with shift towards products, shift towards reactants or no shift. Provide a reason for your choice.
a.) Adding H2O to the reaction vessel:
b.) Adding Helium to the reaction vessel:
c.) Removing Na2SO3:
d.) Increasing the volume of the reaction vessel:
e.) Increasing the temperature of the reaction vessel:
In: Chemistry
A survey found that women's heights are normally distributed with mean 63.5in and standard deviation 2.2in. A branch of the military requires women's heights to be between 58 in and 80 in.
a. Find the percentage of women meeting the height requirement. Are many women being denied the opportunity to join this branch of the military because they are too short or too tall?
b. If this branch of the military changes the height requirements so that all women are eligible except the shortest 1% and the tallest 2%, what are the new height requirements?
In: Statistics and Probability
A buffer solution contains both a weak acid (HA) and its conjugate base (A-) so buffers do not have large changes in pH after addition of a small amount of strong acid or strong base.
What is the pH of 500.0 mL of a buffer composed of acetic acid (0.300 moles) and sodium acetate (0.200 moles) before and after addition of solid sodium hydroxide (5.84 g)? Assume no change in volume with addition of NaOH. pKa = 4.756 for acetic acid.
In: Chemistry