Calculation of pH of Rainwater Due to Carbon Dioxide

Calculate the pH of pure water for a CO2 mixing ratio of 350 ppm at 298 K. What would be the pH at this temperature if the CO2 mixing doubles?

Rate Equation for Atmospheric Oxidation of S(IV) to S(VI)

a) Calculate the liquid phase / gas phase ratio for SO2, HNO3, HCl and H2O2 in a cloud droplet (L= 10-6) and determine which phase dominates. b) Explain why the atmospheric rate of formation of S(VI) in the aqueous phase is given by (Please see attachment for atmospheric rate of formation) where k is the liquid-phase rate constant for the oxidation of S(IV) to S(VI) by X in air with a liquid water content of L. Please give detailed explanation of why you use a certain formula.

A solvent for an industrial process requires the use of phenol or benzene.

A solvent for an industrial process requires the use of phenol or benzene. Both are about the same in effectiveness for the process, and of course, gloves will be used when handling either solvent. As an environmental safety officer for the company, which one would you recommend the use of and why? Also what set-up would you recommend to minimize exposure and risk?

Benzene and Phenol: Discussion of LD50 and LDLO

With Benzene and Phenol: Does one molecules consistently have a greater LD-50 for all species? explain Are the relative LDLO for benzene and phenol as you would expect? How were the LDLO for humans obtained? How reliable are the LDLO? Explain which data you would use to determine a lethal dose for you and calculate the lethal dose.

Precipitation of zinc solids in a wastewater system?

Can you please take a look at the attached and give me some feedback. I want to understand why specifically pH is driven way low and then way high to promote precipitation of the zinc solids. Please take a look and comment. In our process, zinc borate (2ZnO-3H3BO3-3H2O) ultimately splits and dissociates to zinc oxide and boric acid. In the first equation (because I’m only concerned about the zinc), the zinc oxide combines with water in the wastewater plant to form zinc hydroxide. Then, the current treatment scheme doses the zinc hydroxide with phosphoric acid and drives pH down to approx. 2.5 ---- it would appear that zinc phosphate and water are by-products Then, the wastewat... click for more