# Seawater contains 7.6×10−3 g Sr2+ per kilogram of water. What is the concentration of Sr2+ measured in ppm?

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- busterwasmycatLv 74 weeks ago
Convert the Sr mass to mg and you then have mg Sr/kg H2O, which is ppm. 7.6 x 10^-3 g is the same as 7.6 mg, so there are 7.6 ppm (as you defined it) Sr in that water.

If you want to see where the million comes from, convert kg to mg. there are a million mg in one kg. So, you have 7.6 mg Sr in 1 million mg of water.

- AshLv 74 weeks ago
Concentration of Sr²⁺ = (7.6 x 10⁻³ g Sr²⁺)/(1 kg water)

= 7.6 mg Sr²⁺)/(1 L water)

= 7.6 ppm Sr²⁺

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