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Explain How To Find The Percentage Composition Of Hydrates Lab Report

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Percentage Composition of Hydrates

The Introduction:

Hydrates are ionic compounds and are often a type of salt with a definite amount of water as part of their structure. Hydrates are decomposed into anhydrous salt, a no-water compound, and water vapor when heat is applied; water vapor is released from the hydrated compound, which leaves with an anhydrous salt that weighs less than the hydrate. But how do we find the percent of the water that was lost after applying heat to the hydrates and how accurate is finding the percent composition of water using experimentation and a gram weight scale? The purpose of the experiment is to find the percent of water lost by finding the difference between the mass of hydrate and the mass of anhydrous …show more content…

Potassium ion is a positive ion in the hydrate compounds (K+).
67. Dalton’s perception of potassium aluminum sulfate is different from what is known today because Dalton’s structure does not show the hydrogen elements that are included in the hydrate.
68. percent composition by mass of water = [12 (2.01588 + 15.9994)] (12 molecules of H2O) / 474 grams of potassium aluminum sulfate hydrate

VI. …show more content…

In addition, when heat is applied, 36.1% of water is lost from the hydrate. Using theoretical yield with the average atomic masses, I calculated the molar mass of the copper sulfate hydrate (CuSO4 ᐧ 5H2O) to be 249.685 grams, then found the percentage of water lost from the hydrate by dividing 5 water molecules, 90.0764 grams, with the entire hydrate. After doing that, 36.1% is the actual percentage of water that was lost when heat is applied to the hydrate. However, with the experiments, we had lost only 34.5% of water, so it is important to understand how to determine the percent of water in a hydrate that was lost, but also the error percent because knowing the percent error will help me understand what was done wrong, so next time more accurate results would be concluded. For example, because of the 4.4% error, some of the weight may have been lost due to heat circulating in the evaporating dish after applying heat to the hydrate. Therefore, from the experiments, the purpose of finding the percent of water in a hydrate is by dividing the part water into the whole of the hydrate, and every time, during

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