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Problems with solutions week 1 for students

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Problem 1
1 L of water is analyzed for the magnesium chloride. The analysis indicates that the sample
contains 5 mg of the salt. What is the salt concentration in g/L, mg/L, ppm, ppb, ppt, M, mM,
µM, nM and picoM?
Solution
1. 5 mg/L = 5 ppm
5×10−3 g/L
5000 ppb
5 000 000 ppt = 5×106 ppt
2. MW (MgCl2) = 95 g/mol
πΆπ‘š
CM = π‘€π‘Š =
5 ×10−3
95
=0.0000526 M
0.0526 mM
52.6 µM
52 600 nM
52 600 000 pM
1
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