EXPERIMENT 4 Determination of a Chemical Formula LABORATORY REPORT PREPARATION G
ID: 713593 • Letter: E
Question
EXPERIMENT 4 Determination of a Chemical Formula LABORATORY REPORT PREPARATION GUIDE Suggested Questions L. Introduction 1 What is a chemical formula and what are the types of chemical formulas? What do they represent based on the modern atomic theory/law of definite proportions? 2. What is the primary challenge in finding the night or true formula of a compound as it relates to the law of multiple proportions? How is this challenge addressed in this experiment? 3. What were the objectives of this experiment? 4. What gravimetric techniques and chemical properties were used to determine the chemical formula of the hydrated copper chloride? 5. How was the chemical formula in this expeniment caloulated? 6 What procedural modifications were performed in this experiment? Briefly explain. 7. What safety precautions were observed in this experiment?Explanation / Answer
1. chemical formula is the exact amounts of each atom present in a molecule. They define the exact bonding and valence shell electrons of the atoms that form the bonds in a compound.
2. The challenge is to find the accurate ratios of each atom and the experiment here works on the gravimetric analysis where we find the mole ratios of each atom in the formula.
3. Objective is to determine the molecular formula of copper chloride hydrate salt.
4. Weighing the samples before and after the procedure is the gravemetric technique used here. The water of crystallization is lost when copper chloride is heated (chemical property) and undergoes reduction in presence of Al (chemical property).
5. The chemical formula is calculated by calculating moles of Cu, Cl and H2O in the compound obtained by gravemetric analysis experiment.
6. Details missing from experiment.
7. HCl gas is toxic and thus experiment must be carried out in well ventllated fume hood. Proper safety clothing much be work at all times.
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