Hydrate Lab Essay

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Formula of a Hydrate Objective The objective of the experiment is to determine the percent composition of water in a hydrate and to determine the hydrate’s empirical formula. Theory/Background In this experiment, the main purpose was to identify the percent water in a hydrate and to determine the empirical formula of the hydrate. A hydrate is a chemical compound containing water (H2O). After finding the masses of every part in the compound, one would be able to solve for the complete formula of the hydrate. An anhydrous salt is a salt without the presence of water or any moisture. In this experiment the anhydrous salt was separated as well as the water from the hydrate. The mass of the anhydrous salt was one of the parts needed to be calculated in order to find the complete formula of the hydrate. The law of conservation of mass states that matter in a compound can be altered, separated, and pure substance can be destroyed, but the mass always remains the same. In this experiment, the hydrate was separated into water and the anhydrous salt. However, when the masses were combined the overall mass remained constant. In order to find the percent composition, the masses of the water and the anhydrous salt had to be identified. Without these components, it would be impossible to find the percent composition of the water in the hydrate. The empirical formula is the simplest formula of a compound. It is calculated by finding the number of moles in the anhydrous salt and the water and then dividing those results by the lowest number of moles in the two solutions. After finding these results, the answers must be rounded to the nearest whole number. The molecular formula is based on the actual number of atoms in the compound, it is a multiple of the empirical formula. It is calculated by dividing the molecular mass by empirical formula mass. Then, the results are

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