Since the tincture of iodine contains about 2% by mass of iodine, the mass of iodine in a 25 g sample is 0.5g
The term tincture of iodine refers to an solution that contains about 2% iodine by mass.
Given that the mass of the solution is 25g, let the mass of iodine present be x.
[tex]2 = x/25 * 100\\2 = 100x/25\\50 = 100x\\x = 50/100\\x = 0.5 g[/tex]
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