The copper sulfate hydrate that you will use in this experiment is sometimes kno

Question

The copper sulfate hydrate that you will use in this experiment is sometimes known by the common name of blue vitriol due to its bright blue color. Several other hydrates have well- known common names. Find the chemical formulas and scientific names for the following hydrates. Be sure to find the hydrate formulas, not just the anhydrous compound formulas. Plaster of Paris: 1· Epsom salt Glauber's salt: 2. A 18.18 g sample of an aluminum chloride hydrate, AICls.n H20, is heated to drive off the water of hydration. The mass of anhydrous aluminum chloride remaining after heating is 10.04 g. How many waters of hydration are in each formula unit of the aluminum chloride hydrate (what is the value of n)? Show your work. Using values of the enthalpy of formation, AH, for the reactants and products, calculate AH n for the dehydration reaction of sodium sulfate decahydrate. Show your work. H°1 for Na2SOa. 10H20(s) is-4327 kJ/mol. Na2SO 10H20s) Na2S046)+10 H20g

Explanation / Answer

2.

Mass of hydrated salt = 18.18 g.

Mass of anhydrous salt = 10.04 g.

Mass of water = 18.18 - 10.04 = 8.14 g.

moles of water = mass / molar mass = 8.14 / 18.0 = 0.452 mol

Moles of anhydrous salt (AlCl3) = mass / molar mass = 10.04 / 133.5 = 0.0752 mol

SO,

0.0752 mol of AlCl3 has 0.452 mol of H2O

Then, 1 mol of AlCl3 has 0.452 / 0.0752 = 6.01 mol of water.

Therefore, Formula of hydrated salt = AlCl3.6H2O

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