# CHEMISTRY 2018 AS question helpWatch

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#1
sodium fluoride is toxic in high conc. Major health problems can occur if conc of NaF is greater than 3.19*10^-2 per kg of body mass. Deduce the max mass of NaF in mg that a 75 kg person could swallow?

Is the answer 2392.5 Please can somebody tell my if this answer is correct or send me the mark scheme for revision as I am confused. Thank you
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4 weeks ago
#2
(Original post by wyann)
sodium fluoride is toxic in high conc. Major health problems can occur if conc of NaF is greater than 3.19*10^-2 per kg of body mass. Deduce the max mass of NaF in mg that a 75 kg person could swallow?

Is the answer 2392.5 Please can somebody tell my if this answer is correct or send me the mark scheme for revision as I am confused. Thank you
There are lots of units missing, which always makes things tricky.

Assuming it is 3.19 x 10-2 mg kg-1, then 3.19 x 10-2 x 75 = 2.3925 mg. The fact that it is NaF is not needed.
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#3
(Original post by Pigster)
There are lots of units missing, which always makes things tricky.

Assuming it is 3.19 x 10-2 mg kg-1, then 3.19 x 10-2 x 75 = 2.3925 mg. The fact that it is NaF is not needed.
sorry it was 3.19*10^-2 g per kilogram therefore I am assuming the answer is 2392.5mg
thank you
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