1 pg = 10-12 g
molar mass Na = 22.99 g/mol
1 mol Na+ = 6.022x1023 Na+ ions
1 cm3 = 1 mL
Using modern analytical techniques, it is possible to detect sodium ions in concentrations as low as 70 pg/mL.
(b) What is this detection limit expressed in the number of Na+ ions per cubic centimeter of solution? Express your answer using two significant figures.
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