Concept explainers
A 1.628-g sample of a hydrate of magnesium iodide is heated until its mass is reduced to 1.072 g and all water has been removed. What is the formula of the hydrate?
Interpretation:
Formula of the hydrated magnesium iodide needs to be determined for which 1.628 g hydrated sample gives 1.027 g anhydrous salt.
Concept introduction:
Hydrated salts are those which contain certain molecules of water as water of crystallization.
Answer to Problem 186A
Formula of the hydrate is MgI2.9H2O.
Explanation of Solution
Mass of hydrated magnesium iodide is 1.628 g.
Mass of anhydrous magnesium iodide is 1.027 g.
Thus,
Mass of water
Molar mass of MgI2 is 278 g/mol.
Molar mass of H2O is 18 g/mol.
Thus, number of moles of MgI2 and H2O can be calculated as follows:
Putting the values,
Mole of MgI2
Mole of H2O
Mole ratio of MgI2: H2O
So, the formula is MgI2.9H2O.
Formula of the given hydrate is MgI2.9H2O.
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