We have , ppb = ( Mass of solute / mass of solution )
10 9
We have , mass of Cl - = 1.3
10 -7 g , Mass of solution = 1 kg = 1000 g
ppb = ( 1.3
10 -7 g / 1000 g )
10 9
Concentration of Cl - in ppb = 0.13
ANSWER : 0.13
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