The empirical formula of zinc iodide was obtained

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the mass of iodine and the mass of consumed zinc, which was calculated by subtracting the intial amount of zinc by the mass of dry zinc. Thus, the final formula came out to be ZnI2. Also, the Law of Conservation of Mass was validated by the comparison of the mass of the actual product, 2.326 g, and the mass of zinc consumed combined with the mass of iodine, 2.480 g. Although not perfect, the two values were relatively close to each other, confirming this law. Finally, chemical reversibility was proven through the electrochemical decomposition of the zinc iodide in solution. In observing this reaction,
the appearance of Zn precipitate at one electrode and I2 in solution of a yellowish color at the other electrode showed the decomposition of zinc iodide. Moreover, the electrode with the zinc precipitate would be the negative end, for zinc in solution has a positive charge, while the electrode with iodine would be the positive end, since iodine in solution has a negative charge.

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