Gravimetric Analysis Of Copper Chloride Hydrate

1086 WordsOct 21, 20175 Pages
Chemical formulas are central to chemistry; they describe, identify, and predict the properties of compounds. Chemical formulas can be found by a process called gravimetric analysis in which components of a compound are isolated, their masses are found, and the mass differences recorded. Gravimetric analysis can be helpful when finding the formula of an ionic hydrate, an ionic crystal bound to water molecules because it allows for the mass of water to be found allowing for further separation of the remaining elements in the ionic compound. When water is removed from an ionic hydrate, the ionic hydrate becomes an anhydrous ionic compound. Additionally, because of the Law of Definite Proportions, the ratio of moles of water released to…show more content…
The wire reacted with the solution to yield copper; any remaining aluminum was dissolved with a few drops of 6M HNO3. Following the isolation of the copper, it was separated from the solution with a Büchner funnel and flask. A piece of filter paper was weighed, and its mass was recorded. Then, the filter paper was placed on the vacuum flask, which was turned on, and the copper solution was poured over it. The copper was also rinsed with 95% ethanol solution before being set on a paper towel to dry. Finally, one day after the previous step, the copper was weighed, and its mass recorded. The recorded masses were then used to determine the mass of copper, chlorine, and water in the unknown copper chloride hydrate. The resulting masses were used to find the formula of the unknown copper chloride hydrate according to CuxCly•nH2O. Results The mass of water in the unknown Copper Chloride Hydrate is 0.22g, as found by the difference in mass between the sample before and after heating. The mass of copper is 0.29 grams, and the mass of chlorine is 0.49 grams. These values were found by isolating the copper then subtracting the mass of the copper from the mass of the sample after heating to determine the mass of chlorine. The masses were converted into moles with the general formula 1 mole/Molar Mass x mass of given element/compound. For example, the moles of copper were found by multiplying 0.29 grams by 1 mole/63.546 grams (Molar Mass of copper),

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