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The half-cell, Tl | Tl+(1 mol L-1), is connected to a Pt | H+ | H2(1 atm) half-cell in which the concentration of H+ is unknown. The measured cell voltage is 0.0841 V and the Pt | H2 | H+ half-cell is the cathode. Standard reduction potentials are given on the next page. (a) Draw a diagram of the electrochemical cell, labeling all electrodes and solutions. (b) What is the pH in the Pt | H+ | H2 half-cell? (c) What is the value of the equilibrium constant for the reaction occurring in this cell?
What is the pH of a buffer system that contains 0.240 M hydrocyanic acid HCN and 0.190 M sodium cyanide NaCN? The pKa of hydrocyanic acid is 9.31.
Calculate the molar solubility of Fe(OH)2 in a buffer solution where the pH has been fixed at the indicated values. Ksp = 7.9 x 10-16. (a) pH 7.0 M (b) pH 11.0 M (c) pH 13.6 M
To convert from the volume by percent of a gas to the mole fraction of a gas (i.e. problem 35 from chapter 9), why is it that all you have to do is divide the volume percent by 100%
Infrared radiation from the sun has a wavelength of 6200 nm. Calculate the energy of one photon of that radiation.
The optimal temperature for the action of lactate dehydrogenase is 36*C. It is irreversibly inactivated at 85*C, but a yeast containing this enzyme
Atomic absorption spectrometry was used with the method of standard additions to determine the concentration of cadmium in a sample of an industrial waste stream
Write the equation showing the S-trans to S-cis equilibrium of the two conformations for a. (E)-1,3-pentadiene b. (Z)-1,3-pentadiene and which equilibrium will favor the s-tans conformation more strongly?
Fears of radiation exposure from normal use of such detectors are largely unfounded. Identify reasons why ^241Am smoke detectors are perfectly safe.
A flask containing only NO2(g) at an initial pressure of 8.60 atm is allowed to reach equilibrium. Calculate the total pressure in this flask at equilibrium.
A solution of 350mg of optically active 2-butanol in 10 mL of water, placed in a 20 cm cell shows an optical rotation of +6 .24 o. What is the specific rotation of this compound
A 125 lb patient is to receive a drug at a rate of 0.300 mg per 1.00 kg of body weight. If the drug is supplied as a solution containing 5.00 mg/mL, how many milliliters of drug solution should the patient receive
Calculate the activation energy of a certain reaction from the following data: Temperature, degree C Rate Constant 24 7.41x10^-4 48 1.39x10^-1
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