Question

lab experient questions : determination of the emprical formula of zinc iodide

1. what effect would each of the following errors have on the mole of each reacted (indicate if the error would make the zinc too high, too low or unchanged? a) some zinc was transferred during the decantation.

zinc:

iodine:

b) some unreacted zinc was transferred durong the decantation.

zinc:

iodine:

c) the reaction mixture was yellow when the reaction was stopped

zinc:

iodine:

Answer 1

Zinc + Iodine ---> Zinc Iodide

a) If some zinc was transferred during the decantation, there would be more of zinc present compared to that should be present, hence,

zinc: high

iodine: unchanged

b) Similarly, when some unreacted zinc was transferred during the decantation, more zinc will come to the container containing product

zinc: high

iodine: unchanged

c) The formation is zinc iodide is reflected by the yellow colour. Since, iodine is limiting reagent, it will be completely consumed and the excess zinc will remain unreacted.

zinc: low

iodine: unchanged