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# In this experiment we hope to find the formula of a compound - a yellow compound formed when copper reacts directly with iodine vapour.

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Introduction

Experiment. In this experiment we hope to find the formula of a compound - a yellow compound formed when copper reacts directly with iodine vapour. Apparatus. Copper Strip, emery paper, dry filter paper, access to a balance, iodine crystals, boiling tube and a Bunsen burner. Method. We took a strip of copper and cleaned it with emery paper. Following this, we weighed the strip on a top pan balance. We placed the strip of copper into a boiling tube with the end bent around the lip of the boiling tube. ...read more.

Middle

A purple gas was emitted from the iodine crystals when heated and as the experiment continued, an obvious change in colour of the copper strip was apparent. We continued to heat the boiling tube until no purple gas was seen. Results. Initial Mass of copper strip 1.332g Mass of copper strip + copper iodide 1.608g Final mass of copper strip 1.191g Mass of copper that has reacted with the iodine: 0.141g Mass of iodine it reacted with: 0.276g No. of moles of copper atoms reacted (Ar Cu=63.5): 0.0022205 No. ...read more.

Conclusion

Another error may have been that we lost a substantial amount of the purple vapour while heating the test tube and this would affect the amount of copper iodide formed on the copper. Uncertainties, or experimental errors, would include the weighing of the masses. When weighing the masses of the copper strip, the copper iodide, etc. we used top-pan balances. Top-pan balances round off masses to a certain degree of accuracy and our balances read off at 2dp. The experimental error here is that there is a small space for error to occur in the rounding off process. This is called percentage error. Percentage error = error x 100 Reading Therefore : 0.005g x 100 = 0.04% 11.46g ...read more.

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