A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 ∘C. The initial concentrations of Pb2+ and Cu2+ are 5.20×10−2M and 1.50 M, respectively.
A) What is the cell potential when the concentration of Cu2+ has fallen to 0.250 M ?
B) What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.36 V?
In: Chemistry
1)Info:
a)Consider the equilibrium:
Ag (NH3)2^+ + Cl^- <------> AgCl + 2NH3
b) Based on the stoichiometry of the reaction, which
of the conditions constitutes an excess of NH3 over Cl-? (3:1 or
30:1)
Both ratios work
~~~~~~~~~~~~~~~~~~~~~~~~
Question:
c) Based on your answer to part (b), which ion (Cl-/NH3) forms a
stronger bond to Ag+. State your reasoning.
d) Derive and calculate the Keq value for the
equilibrium above (part (a)) using the following values of the
equilibrium constants:
Kf[Ag (NH3)2+] = 1.7 x 10^7 and
Ksp(AgCl) = 1.7 x 10^-10
In: Chemistry
Describe the influences and forces driving the formation of the
lipid bilayer. Briefly
discuss the effect of a phase transition on a lipid bilayer.
In: Chemistry
12.
a) Consider a sample of hemoglobin molecules all bound to carbon monoxide CO. What conformation would be favored? What would the Hill plot of that sample look like?
b Consider a sample of hemoglobin molecules all bound to BPG. What conformation would be favored? What would the Hill plot of that sample look like?
In: Chemistry
In the simple distillation of a mixture of toluene and cyclohexane, the average highest temperature recorded was in 95 degrees Celsius. Explain why in the fractional distillation of the same mixture, the average highest temperature was 108 degrees Celsius.
In: Chemistry
The molality of an aqueous sodium nitrate solution is 2.81 m. What is the mole fraction of NaNO3? The molar mass of NaNO3 is 85.00 g/mol; the molar mass of water is 18.02 g/mol. 0.0506 0.239 0.00281 0.193 0.0482
In: Chemistry
In: Chemistry
Ammonia, NH3, and oxygen can be reacted together in the presence of a catalyst to form only nitrogen monoxide and water. The number of moles of oxygen consumed for every 9.00 moles of NO produced is :
In: Chemistry
sodium bicarbonate 10 g sodium carbonate 12.72 g, add-50 ml of deionized water to the beaker and stir until all of the weak acid or weak base has dissolved. Carefully and slowly pour the weak acid or weak base solution into the volumetric flask.
preparation of Buffer
pour your weak acid and your weak base together into a bottle.
How many grams of sodium bicarbonate (M.W.= 84.01 g/mole) would you have had to weigh out to make up 500ml of a 0.300M solution of this weak acid?
It takes 0.500liters of 4.00 M Naoh (lye) solution to clean a drain. How many grams of Naoh would have to be weighed out?
How many grams of any solid would you need to weigh out to make 2.5L of a 4% solution? (Recall, a 4% solution means 4 g/100 mL)
You will make up 100ml of a 0.20 M solution of a weak acid, sodium bicarbonate and 100ml of a 0.20 M solution of its conjugate base, sodium carbonate.
How many grams of weak acid should be weighed out? How many grams of conjugate base should be weighed out?
Do I put acid first in the water first or base in the water first? Can you write more legibly please?
In: Chemistry
if you had used a calorimeter that was not insulated as well, how would your results be affected? what about a calorimeter that was more insulted?
In: Chemistry
Match the correct term with the description:
Terms: Metal ion indicator, acid-base indicator, auxiliary complexing agent, direct, back,
displacement, indirect, and masking agent.
Titration where anions that precipitate with metal ions can be measured. ___________
Titration where the analyte is titrated with standard EDTA. _______________
Ligand that is added to keep some component of the analyte from reacting
with EDTA. _____________
Compound that changes color when bound to a metal ion. _______________
Titration where the analyte is treated with a metal-EDTA complex. _________
Compound that has a different color for each protonated state. _______________
Ligand added to keep metal ions from forming solid hydroxides. _______________
Titration where an excess of EDTA is added to the analyte. _______________
In: Chemistry
1. A sample of methane gas that occupies a volume
of 12.8 L at a temperature of 0 °C and a pressure
of 1 atm contains ________ moles of gas.
2. A mixture of argon and helium gases, in a 9.49 L flask at 39 °C, contains 6.75 grams of argon and 1.61 grams of helium. The partial pressure of helium in the flask is _______ atm and the total pressure in the flask is _______ atm.
In: Chemistry
Calculate the enthalpy of reaction for the following reaction using Hess's Law and the equations provided below.
Target Reaction: Sr(s)+C(graphite)+1 1/2 O2(g) -----> SrCO3(s) H(degrees)=?
C(Graphite)+ O2(g)-----> CO2(g) H(degrees)= -349kJ
Sr(s)+ 1/2 O2(G)-------> SrO(s) H(degrees)= -592kJ
SrO(s)+CO2(g)-------> SrCo3(s) H(degrees)= -234kJ
In: Chemistry
If 25.0 mL of a 0.238M FeO4^2- solution is allowed to react with 55.0 mL of 1.47 M aqueous ammonia, what volume of nitrogen gas can form at 25°C and 1.50 atm?
Volume = mL
In: Chemistry
Preparation of a buffer:
Dissolve in a beaker 27.3 g NaC2H3O2·3H2O in water containing 60 mL
of 1 M HCl (you need to make a 250- mL of 1 M hydrochloric acid
solution in advance by the appropriate dilution of concentrated
HCl) and dilute with the distilled water to 1 L. Invert the bottle
up to 20 times and keep the buffer in a 1 L glass bottle.
*help with dilution of concentrated hcl
In: Chemistry