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Question 4 1 pts The carbonic acid content of a water sample must be considered to determine the reagent requirements for the lime soda softening process. Given: = = pH = 7.1 Total Alkalinity = 203 mg/L "as CaCO3" Total Hardness = 297 mg/L "as CaCO3" Calcium Hardness = 235 mg/L "as CaCO3" = = Calculate the concentration of carbonic acid H2CO3 in moles per liter (i.e., M) using the data provided. Then enter the numerical value for your answer. Between 0.0008 and 0.0006