Question
 The irrigation water contains CO2ZHCO3, Ca++
and Mg++ ion 1, 4, 2.5 & 1.5. Calculatethe RSC (residual sodium carbonate) in irrigation water (mcl-1).Solution
RSC= (CO3- + H2CO3)- (Ca2+ + Mg2=)
RSC+ (1+4)-(2.5+1.5)=(5-4)= 1
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