Considering the enthalpy of mixing (ΔH mix), which statement is correct? a. Pb(NO3)4 is more strongly...

Considering the enthalpy of mixing (ΔH mix), which statement is correct?

a. Pb(NO3)4 is more strongly hydrated than Pb(NO3)2.

b. CsBr is more strongly hydrated than KBr.

c.The ΔH mix of SrBr2 is more exothermic than the ΔH mix of CaBr2.

d.The ΔH mix of FeCl2 is more exothermic than the ΔH mix of FeCl3.

Expert Solution

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Answer is A

Strongly Hydrated means being surrounded by Water Molecule.

In first Pb is in +4 oxidation state in (Pb(NO3)4)

and Pb is in +2 oxidation state in (Pb(NO3)2)

Solvation is influenced by charge to size ratios. Higher the charge to size ratio, the easier it is for the species to be solvated by water molecules.

Hence Pb+4 is small in size so it is highly hydrated.

Positive ions will much more strongly attract the oxygen atom than the hydrogen atoms in water. The oxygen atom in water has a locally high electron density (partial negative charge), while the hydrogen atoms has a locally low electron density (partial positive charge). The strongest attraction happens when oxygen atoms point towards the cations, and the hydrogen atoms point away

queen_honey_blossom answered 2 years ago

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