The following mineral analysis was reported for a water sample taken from Well No. 1 at the Eastwood Manor Subdivision near McHenry, Illinois. Note: All concentrations reported as "mg/Lof ion"

unless stated otherwise. (a) Determine the unknown sodium concentration in mg/L of Na* using the electro neutrality condition. (b) Determine the total, carbonate, and non carbonate hardness in mg/L as CaCO3 using only the predominant polyvalent cation definition. Also construct the meg/L bar chart. (c) Calculate the total, carbonate, and non carbonate hardness in mg/L as CaCO3 using all the polyvalent cations. What is the percent error in using only the predominant cations?