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A portable photometer with a linear response top radiation registered 83.2 microamps with a blank solution in the light path. Replacement of the blank with an absorbing solution yielded a response o
a total alkalinity of 0.003 equivalents/Liter (the former determined by use of a PH meter, and the latter determined by titration with standardized acid to a methyl orange endpoint). Calculate [CO2]
Calculate the equilibrium constant for the reaction. The standard enthalpy change delta H, for a strong acid-strong base reaction is -57.8k J. Determine the standard entropy change delta S for the r
Draw all of the resonance forms of 4-nitrobenzaldehyde which contribute to the enhanced electrophilicity of the aldehyde carbon relative to benzaldehyde
The concentration of O2 in water required to support aerobic aquatic life is 4.0 mg L-1. What is the partial pressure in torr of O2 in the atmosphere that corresponds to this concentration. The Henr
a photometer with a linear response to radiation gave a reading of 595 mV with a bank in the light path and 139 mV when the blank was replaced by an absorbing solution. Calculate
Choose the answer which presents the chemical formulas for two substances in order of decreasing melting point (highest melting point first) and gives a valid reason for this order.
The Henry's Law constant for carbon dioxide gas in water at 25 oC is 0.031 mol/L-atm. Calculate the solubility of carbon dioxide in water at 25 oC in moles/L if the partial pressure of carbon dioxid
what experimental variables must be controlled to assure reproducible absorbance data
What is the purpose of a. the 0% T adjustment and b. the 100% T adjustment of a spectrophotometer
Use the formula for ?G to find ?G for a reaction if ?G° = 7.27 kJ?/?mol, T = 282 K, R = 8.31 × 10?3 kJ?/?mol?•?K, and Q = 0.67. Also, tell whether the reaction will shift toward the p
what minimum requirement is needed to obtain reproducible results with a single beam spectrophotometer
The complex formed between Cu(I) and 1,10 phenanthroline has a molar absorptivity of 7000 L cm-1 mol-1 at 435 nm, the wavelength of maximum absorption.
Suppose 50.0 mL of 0.250 M CoCl2 solution is added to 25.0 mL of 0.350 M NiCl2 solution. Calculate the concentration, in moles per liter, of each of the ions present after mixing. Assume that the vo
what is the change in temperature of the water after the ice has completely melted? The enthalpy of fusion of water is 6.02 kJ/mol, and the specific heat capacity of the liquid is 4.184 J/g/K. Assum
a solution that contains 5.94 ppm iron(III) is treated with an appropriate excess of KSCN and is diluted to 50 ml. What is the absorbance of the resulting solution at 580 nm in a 2.5 cm cell
At 580 nm the wavelength of its maximum absorption, the complex FeSCN2+ has a molar absorptivity of 7X10^3 L cm-1 mol-1 calculate
What are the units for absorptivity where the path length is given in centimeters and the concentration is expressed in. a. parts per million
find the total heat released by the reaction of 100.0 mL of 0.8500M NaOH and 100.0 mL of 0.8404M acetic acid.
Include all reaction steps, a detailed mechanism and all reagents necessary. Make a note of any special purification steps if necessary. Synthesize 1,3,5-tribromobenzene from benzene or toluene.
Which indicator would be the best to use when titrating ammonia with nitric acid? Kb of NH3 is 1.8 x 10-5.
Why does the non aqueous reaction of pyridine and SnCl4 produce a white precipitate
A stock solution is prepared by adding 20 mL of 1.31 M AlCl3 to enough water to make 74 mL. What is the Al3+ concentration of 45 mL of the stock solution?
A sophisticated ultraviolet/visible/near-IR instrument has a wavelength range of 185 to 3000nm. What are its wavenumber and frequency ranges