I need to calculate the buffer capacity in acid and in a base from these data. Then I need to write a short paragraph ( 7 sentences) explaining what happen and why one is better buffer that the other.

Buffer Capacity = (number of moles of OH- or H3O+ added)

                   (pH change)(volume of buffer in L)

Buffer capacity in acid 25.0 ml of 0.10M acetic acid and 0.10 M Sodium acetate solution

Buffer capacity in base

Type your answer plase

Indicate two psi angles that are obviously unacceptable in a normal protein structure(except for linkages with Gly&Pro), and explain with Newman projections

How much of a change in freezing point would the ocean experience if the glaciers and icebergs melted? Here is what i have so far:

If all of the glaciers and ice caps on earth melted, 24,064,000 cubic kilometers of fresh water would become mixed in with the ocean’s 1,338,000,000 cubic kilometers of saline water.

24,064,000 km^3 + 1,338,000,000 km^3 = 1,362,064,000 km^3

Currently, the ocean’s salinity is 3.5% (http://water.usgs.gov/edu/whyoceansalty.html). The ocean’s salinity would decrease to 3.4% if all of the glaciers and ice caps were to melt.

1,338,000,000 km^3 saline water x .035 = 46,830,000 km^3 salt

46,830,000 km^3 salt / 1,362,064,000 cm^3 = .034 0.034 x 100 = 3.4%

Currently the freezing point of the ocean’s surface is -1.8 degrees Celsius (28.8 degrees Fahrenheit) (http://nsidc.org/cryosphere/seaice/index.html).

I know it's a freezing point depression question and i use

Delta Tf = m x Kf

Kf of water is 1.86 C/m

But I can't figure out how to get 46,830,000 km^3 salt into molality (moles/kg solvent)

Thanks!!

Describe the principles of immunocytochemistry/immunohistochemistry and how the technique can be usefully employed in the diagnosis and classification of tumours

How many calories are required to heat 62.0 kilograms ice from 0 degrees celsius to 47.0 degrees celsius?

2 C₈H₁₈ + 25 O₂ --> 16 CO₂ + 18 H₂O
How many grams of CO₂ is released inot the atmosphere by the complete combustion of 40.0 gallons of gasoline? Assume the formulat for gasoline is C₈H₁₈ with a density of 0.703 g/mL.

Consider the titration of 0.100 L of 0.200 M sulfurous acid (see Ka/Kb table from table) with 0.500 M NaOH. What is the pH at the endpoint of the titration?

1.Determine the molarity pf a calcium nitrate solution that contains 40.0 grams in a total solution volume of 250 mL.


2. How many grams of lithium carbonate are required to prepare 250 mL of a 0.655 molar solution?

3. What volume of 2.00 molar H2SO4 is needed to prepare 750 mL of 0.0950 molar sulfuric acid?

Answer the following questions about molecular-formula equations and net-ionic equations.

Part 1:

Molecular Formula Equation: Lead (II) nitrate is combined with sodium sulfate. Write the formulas of the starting materials and predict the products. Balance the Molecular Formula Equation, and enter the sum of the coefficients below (include any implied ones):

Part 2:

Total Ionic Equation: Part 1: In the reaction in part one, determine how each substance appears in the reaction. For example, does the substance appear as dissociated ions? Do the ions remain together? Rewrite the equation with everything written as they appear in the reaction. How many total UNIQUE substances are in your equation.

For example: Na+(aq) + Cl-(aq) + Ag+(aq) + NO3-(aq) → Na+(aq) + NO3-(aq) + AgCl(s)

This reaction has 7 unique substances.

Part 3:

Total Ionic Equation: Part 2: using the coefficients and subscripts of your original balanced equation, write the total ionic equation, and sum up all coefficients (including implied ones). Enter your sum below:

Part 4:

Net Ionic Equation: Part 1: Finally, cancel any substances that remain unchanged from the beginning to the end of your TOTAL IONIC EQUATION. How many UNIQUE substances remain? Enter the number below:

Part 5:

Net Ionic Equation: Part 2: Balance the equation determined in part 4. Add up the coefficients (including any implied ones), and enter the sum below.

in a test tube containing 2 mL of 2.4*10^-4 M KSCN, and 23 mL of 0.10 M Fe(NO3)3, what are the number of moles of SCN^-, the number of moles of FeSCN^2+, and the concentration of FeSCN^2+ in mol/L?

explain why the carbons of even chain fatty acids can never be used to synthesize NET glucose, but that the 14C from labeled fatty acids will be found in glucose.

LI²⁺ ion

(a) Calculate energy (in Joules) of the 2p_x orbital of the ion

(b) Calculate energy (in Joules) and Wavelength (in nm) of the transition from the 4s orbital to the 2pz orbital of the ion

(c) Calculate ionization energy of the ion

O3 + O -->2O2)
Depletion of the ozone layer is believed to be caused by chlorine catalyzed O3 decomposition. For the uncatalyzed reaction Ea,f= 19 kJ/mol. For the following mechanism, Ea1, f =2.1 and Ea2,f =0.4 kJ/mol:
Proposed Mechanism:
Cl+O3--> ClO +O2
ClO+O--> Cl+O2

a.) What is the dH for the reaction?
I know the answer is -390 kJ/mol. I don't know where this answer comes from!

b.) What is the Ea, r for the uncatalyzed reaction?
I know the answer is 409 . likewise I don't know where this number comes from . I see added and subtracted numbers but I need an explaination.

c.) Which step in the above catalyzed reaction is faster ?
How would I know ?
d.) If dH* for the first reaction is -165 kJ/mol, sketch the energy profile for the reaction.
dH* kJ/mol O3= 142.3 ,Cl=121.7 , O=247.5
Sketching energy profiles for the reaction how ?
------------
Based on a graph of Energy vs. Reaction pathway.
a.) How do I determine the intermediates formed in the reaction ?

b.) How many transition states are there and how do I identify them from the graph?
(The graph has has three humps, )

c.) How many activation complexes are there ? How do I identify them from a graph?

d.) How do I determine which step is the fastest and which step is the slowest ? from a graph

e.)Is the reaction A-->B exotherminc or endothermic , how do I know based on the graph.

A mole of air is sampled from the atmosphere when the atmospheric pressure is 765 mm Hg, the

temperature is 25 C, and relative humidity is 75%. The sample of air is placed inside a closed container

and heated to 135 C and then compressed to 2 atm. What are the relative humidity, the humidity, and the mole fraction of water in the compressed air?

Determine Kb for the nitrite ion, NO2-. In a 0.10-M solution, this base is 0.0015% ionized.

In the manufacture of an active pharmaceutical ingredient (API), the API goes through a final purification step in which it is crystallized , filtered, and washed. The washed crystals contain 47 wt% water. They are fed to a tunnel dryer and leave the dryer at a rate of 165 kg/h containing 5% adhered moisture. Dry air enters the dryer at 145°F and 1 atm, and the outlet air is at 130°F and 1 atm with a relative humidity of 50%. Calculate the rate (kg/h) at which the API enters the dryer and the volumetric flow rate (ft3/h) of inlet air.