Using an iron stock solution of concentration 700 ppm in water, 4 separate calibration standards of concentration 5, 10, 15 and 20 ppm were prepared in 250 ml volumetric flasks.

(i) What volume of the stock solution must be dispensed into the flasks prior to making the volumes up to the mark with water?

(ii) What is 700 ppm in % v/v and in moles per liter (M)?

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