show all work please

Given: pH=7.1TotalAlkalinity=203mg/L"asCaCO3TotalHardness=297mg/L"asCaCO3"CalciumHardness=235mg/L"asCaCO3" The following guidelines for adding lime soda softening process chemicals are adanted from Nazaroff 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