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Chemical Bonding and Molecular Structure question

2021 · 31 Aug · Shift 1 · Q18
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Chemical Bonding and Molecular Structure question

2021 · 31 Aug · Shift 1 · Q18

JEE MainChemistryChemical Bonding and Molecular StructureNumerical+4 / −1
The number of hydrogen bonded water molecule(s) associated with stoichiometry CuSO4.5H2OCuSO_4.5H_2OCuSO4​.5H2​O is ‾\underline{\hspace{2cm}}​.
Numerical answer
View written solutionFree

Correct answer: 1

  1. We need to find, in CuSO4⋅5H2OCuSO_4\cdot 5H_2OCuSO4​⋅5H2​O, how many water molecules are hydrogen-bonded rather than directly coordinated to copper.

  2. The structure of copper(II) sulfate pentahydrate is well known:

    • It is better represented as [Cu(H2O)4]SO4⋅H2O[Cu(H_2O)_4]SO_4\cdot H_2O[Cu(H2​O)4​]SO4​⋅H2​O
    • Here, 4 water molecules are directly coordinated to Cu2+Cu^{2+}Cu2+.
    • The 5th water molecule is not directly bonded to copper; it is present as water of crystallization and is associated through hydrogen bonding with the sulfate ion and other water molecules.

  3. Therefore:

    • Coordinated water molecules =4=4=4
    • Hydrogen-bonded water molecules =1=1=1

  4. Hence, the number of hydrogen-bonded water molecule(s) is 1\boxed{1}1​

  5. Comparison with stored correct answer:

    • Derived answer: 111
    • Stored correct answer: 111
    • These agree.
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