Can you please solve questions from 1 to 4 and the rest if that is possible ? th
ID: 1009578 • Letter: C
Question
Can you please solve questions from 1 to 4 and the rest if that is possible ?
thanks
Arsenate is AsO_4^3. while is arsenite is AsO_3^3. What is the oxidation number of arsenic in arsenate? +9 +3 -8 +5 Microbes can convert arsenate to arsenite. In this case the arsenic is being: Reduced Oxidized Neither Ethylene dibromide (ETB) has been found in some wells in State College, PA. ETB has a specific gravity of 2.2, and has a solubility of 0.4 g/100 g of water. The oral potency factor is 85 (mg/kg-day)^-1 and the RfD is 9.3 times 10^3 mg/kg-day. What is the solubility of ETB in mg/L? Calculate the safe concentration of ETB in the water considering both the RfD and the oral potency factor. You decide to use pump and treat to remove the ETB from the groundwater. You are told that the aquifer is contaminated for 1000 ft. The groundwater has a concentration of 1 ppb and you need to remove it down to 0.05 ppb. The aquifer has a hydraulic conductivity of 1000 gal/ft^2 day, a hydraulic gradient of 0.003 and an area of 50 ft^2. Calculate how long it will take to remove the ETB to acceptable levels if you pump the water at the same rate as the flow in the aquifer. You are brought in as an engineer to remove the ETB from the groundwater. Your boss recommends that you look into bioremediation and soil/vapor extraction. What information would you need to know to determine if either of these techniques will work?Explanation / Answer
The different techniques used for the determination of the solubility of compounds in supercritical carbon dioxide are described. A comparative study is made of the methods used in the measurement of the concentration of benzoic acid and caffeine in supercritical carbon dioxide. The difference in measurement techniques did not have much effect on the solubility data at lower pressures. However, at higher pressures, the solubility data obtained by different techniques began to deviate from each other.
Further, the method used by different researchers in generating the solubility data in supercritical carbon dioxide is also discussed. A number of data sheets have been prepared from these articles containing important information like the solubility, pressure range, temperature range, error in measurement of solubility. and also a brief explanation of the measurement technique. These data sheets form part of an IUPAC-NIST solubility data series project.