When ammonium chloride (NH Cl) is dissolved in water, the solution becomes colder.
a. Is the dissolution of ammonium chloride endothermic or exothermic?
b. What can you conclude about the relative magnitudes of the lattice energy of ammonium chloride and its heat of hydration?
c. Sketch a qualitative energy diagram similar to Figure 13.6 for the dissolution of NH Cl.
H3C
d. Why does the solution form? What drives the process?
Furthermore , Could you kindly explain why the answer is so for questions a and b?
thank you!
Answers
(i) The dissolution ofo Ammonium chloride in water is endothermic, but still it dissolves in water. Answer: Whether or not the heat of solution is an endothermic or an exothermic process depends on the relative magnitude of the lattice energy and the heat of salvation.
(ii) The lattice energy of ammonium chloride is greater than its heat of hydration. ... Lithium iodide has a lattice energy of -7.3 x 10 kJ/mol and a heat of hydration of -793 kJ/mol.
(iii) Protonation of 1-hexanol to give the corresponding alkyloxonium ion, the curved arrow mechanism.
(iv) Summing the negative of the lattice energy (which is ΔHSolute) and the heat of hydration gives the heat of solution. When a substance is dissolved in water, if heat is release the solution processes is called as exothermic; where as if heat is absorbed, the processes is called as endothermic.
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