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Question
If the concentration of Na, Ca and Mg in a water sample are 345, 60 and 18 mg/1, respectively, then the Sodium Absorption Ratio (SAR) of this water will be:
A.
5
B.
10
C.
39
D.
55
Answer ( Option B)

10

Solution

As we know that, 
Where, 
Na+ = Concentration of Sodium ions in 
milli-equivalents per litre (meq/l).
Ca++ = Concentration of Calcium ions in 
milli-equivalents per litre.
Mg++ = Concentration of Magnesium ions in 
milli-equivalents per litre.
But in question concentration of ions are given in mg/l, So, firstly convert all given concentrations in meq/l by using the formula mentioned below:
To convert milli-gram per litre (mg/l) to milli-equivalents per litre (meq/l) 
 

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