Which formula is used to calculate residual sodium carbonate (RSC)?
Correct answer A. RSC = (CO3 + HCO3) - (Ca + Mg)
Explanation
Residual sodium carbonate measures carbonate and bicarbonate left after precipitating calcium and magnesium: RSC = (CO3 + HCO3) minus (Ca + Mg), all in meq/L.
Answer checked How we write and check questions
Discussion