I have already looked at a few solutions and none have worked to come up with a correct solution. Please show how to solve this problem. A ground water sample , at 25 C, has Eh= 1.0 and pH=6.80. Assuming the system is at equilibrium, calculate the amount of dissolved oxygen (ppm) in the groundwater sample.
I thought I had the answer but I was wrong. Please show how to solve. Calculate the mass percent of methanol, ethanol, and MTBE each that must be present in gasoline to yield a mixture of 2.9 % oxygen by weight. Hint given: Calculate percent oxygen in each compound. I don't have the density of the gasoline in the ques ...continues
Weak acid and corresponding ion concentrations.
What are pH, [H3O+], [HSO3–], and [SO32–] in a 1.50 M sulfurous acid solution?
If the concentration of atmospheric CO2 were to double from its current value of 390 ppm, what would be the calculated pH of rainwater assuming that CO2 was the only acidic input?
Radioactive Decay : Time for Iodine-131 to Decay to less than 0.1 Curie
Suppose that a vial containing 10 Curies of Iodine-131, which has an 8-day t½, is accidentally spilled in a hospital room. About how long would it take before the I-131 radioactivity would decay to less than 0.1 Curie? Please explain
Length of Time Required for a Radioactive Substance to Reach a Given Radiation Level
1. Following a terrorist release of Cesium-137 (half-life of 30 years) in downtown, clean up efforts were successful in removing all but 100 curies. How long will it take for the contamination to decay to about 5 curies? A. 90 years B. 130 years C. 175 Years D. 215 years please explain
ADI (Acceptable Daily Intake) Given NOAEL (No Observable Adverse Effect Level)
Given a NOAEL of 500 mg/kg/day based on a long term chronic animal study, the ADI (mg/kg/day) would be? A. 0.5 B. 5 C. 50 D. 5,00 Explain
Stratification (Layers) in a Body of Water (Oceans and Lakes)
Draw a diagram showing the stratification in a body of water. Label the different layers and describe the type of chemistry (and species) that occurs at each level. I do not know how to draw the diagram and what layers to include?
Oxidizing and reducing limits for the thermodynamic stability of water
What determines the oxidizing and reducing limits for the thermodynamic stability of water? Provide equations in your answer and an explanation of the processes.
Cation Exchange Capacity (CEC)
A sediment sample of clay was equilibrated with ammonium ion (NH4+). The ammonium ion was then displaced with Na+. The total amount of ammonium that had been adsorbed by the sediment sample was 55.8 milliequivalents (meq) and the sample had a dried mass of 82.4 g. Calculate the cation exchange capaciticy (CEC) in meq/100g.
