1. Calculate dissolved N2 and CO2 saturation levels in pure water (in mg/L ) if exposed to atmospheric air at 25C. 2. Groundwater sample was analyzed, and the following ion concentrations were reported. Ca+=94mg/LHCO3=317mg/LMg2+=24mg/LSO42=67mg/LNa+=14mg/LCl=24mg/L a) Determine the total hardness groundwater (in meq/ L and in mg/L as CaCO ). According to the EPA classification is this groundwater sample 'very hard', 'hard' or 'soft'. Does this groundwater need treatment prior use? Is the water electroneutral? b) Determine carbonate and non-carbonate hardness of the water sample, each in mg/L as CaCO 3. c) Determine alkalinity of the water sample in mg/L as CaCO 3. d) Build the milli-equivalent bar graph for this water sample. e) Calculate the stoichiometric amount of lime and soda ash concentration needed to soften this groundwater