Calculate the mass of salt that must be added to 150 g of water to prepare a solution that is 15.00% salt by mass.
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Iron(II) can be oxidized to iron(III) by the dichromate ion, which is reduced to chromium(III) in acidic solution.
A 2.5000 g sample of iron(II) ore is dissolved in water and the iron(II) converted into iron(III) by . Exactly 19.17 mL of is required in the titration. What percentage of the ore sample was iron?