Introduction for CHE LAB

# Introduction for CHE LAB - Jake Smith 10/11/11 CHE LAB...

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10/11/11 CHE LAB 111-009-016 Kacey Rocazella Fariba Karimi Objective To learn how to do a gravity filtration. To find the percent composition of a compound. To find the empirical formula of a compound. To acquire information about hydrated compounds. In the lab Students work together in groups of two Waste The copper should be placed in the bucket labeled “Copper Waste.” The dried copper salt should be poured in the “Copper Waste” container. The filtrate (liquid) should be disposed of in the aqueous waste container. Aluminum should be placed in the “Aluminum Waste” container. Safety Students need to wear gloves when working with the copper salt solution. Avoid inhalation and exposure to eyes when dealing with solid reagents. Use a brush to clean the balance after each use. Wash hands thoroughly before leaving the lab. Using experimental data collected from the lab the empirical formula of a compound can be found. The percent composition of the different components must be found in the laboratory. These percentages can determine the empirical formula for the compound. The resulting formula can support other experimental results, or disprove the hypothesized identity of the substance. Mass % of A = (Mass of A)(total mass of substance A) x 100 A is one constituent of the substance. Since mass percent is an intensive property it is independent. Mass percent values from many experiments can be compared if they are done on portions of a common sample. In the experiment, we will find the mass percent of copper and the mass percent of water in a copper salt. Once the percent of water and copper is determined, the percent of chlorine can be found. Mass Percent of Water We can find the mass of water lost and the mass percent of water in the compound by drying the salt. The mas of any water molecule must in included when finding the molar mass of a hydrate. Mass Percent of Copper

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## Introduction for CHE LAB - Jake Smith 10/11/11 CHE LAB...

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