Concept explainers
Table 4 shows data from an experiment to determine the formulas of hydrated barium chloride. Determine the formula for the hydrate and its name.
Interpretation:
The formula and name of the given hydrate of barium needs to be determined.
Concept introduction:
Number of water molecules present per molecule of a compound is known as water of crystallization.
Answer to Problem 181A
Name of the hydrate is barium chloride dihydrate.
Formula is BaCl2.2H2O.
Explanation of Solution
Molar mass of BaCl2 is 208 g/mol.
Molar mass of H2O is 18 g/mol.
Total mass of hydrated salt and crucible is 31.35 g.
Mass of the crucible is 21.30 g
Thus,
Mass of hydrated salt
Mass of the salt and crucible after 5 minutes heating is 29.87 g.
Mass of anhydrous salt
Now, number of moles of barium chloride and water can be calculated as follows:
Thus,
Moles of BaCl2
Moles of H2O
Moles ratio of BaCl2:H2O
Formula is BaCl2.2H2O.
Thus, the formula of the hydrate is BaCl2.2H2O which is called barium chloride dihydrate.
Chapter 10 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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