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Evgen [1.6K]
3 years ago
11

how much sodium chloride must be added to 100 mL of water so that its concentration is 20 parts per million assume that the dens

ity of water is 1.00g/ml
Chemistry
1 answer:
OlgaM077 [116]3 years ago
6 0
Answer: 2mg

Part per million is unit that equal to mg/kg of water or simply 10^{-6} . In this case, you asked how much NaCl needed and know the volume of water(100mL), concentration(20ppm or 20 mg/kg) and water density.
Then, the equation would be

concentration = NaCl weight/ water weight
20 x 10^{-6} mg= NaCl weight/ (100ml x 1g/ml)
NaCl weight= 20x 10^{-6} mg/kg x 100g 
NaCl weight= 2000 x 10^{-6} g
NaCl weight= 2x 10^{-3} g = 2mg
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