Question: Given: pH=7.1 Total Alkalinity =203mg/L as CaCO3 Total Hardness =297mg/L as CaCO3n Calcium Hardness =235mg/L as CaCO3 The following guidelines for adding lime

Given: pH=7.1 Total Alkalinity =203mg/L "as CaCO3 " Total Hardness =297mg/L

Given: pH=7.1 Total Alkalinity =203mg/L "as CaCO3 " Total Hardness =297mg/L "as CaCO3n Calcium Hardness =235mg/L "as CaCO3 " The following guidelines for adding lime soda softening process chemicals are adapted from Nazaroff and Alvarez-Cohen, 2001. If Mg2+ hardness removal is not targeted, 62.5 should be omitted. Note that all values in the above table are in mg/L "as CaCO3 ". How much sodium carbonate (Na2CO3 ) is needed for the water for the lime soda softening process? Enter only the numerical part of the answer in units of mg/L "as CaCO3

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