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Look at the position of Pb in the Periodic Table and the postion of the Alkali Earth metals.

Alkali Earth Metals are in noble-gas configuration when they are doubly charged cations.

Lead however is on the right hand side, and would like to have more electrons to get into that stablest configuration; making the bonds in lead-compounds more covalent -and stronger- in nature.

Insoluble compounds have lattice enthalpies higher than the enthalpy of solvation.

Now since Alkali Earth metals like to be in ionic states; their compounds will dissolve in general more easily than the same compounds with lead, since usually the lattice energy of lead compounds is much higher (In case of insoluble compounds higher than the energy that would be released upon solvation, which thus doesn't occur).

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13y ago

1) NaOH : solubilities between alkaline earth metals and lead are similar as we can see alkaline earth metals show cloudy and solid and lead show cloudy as well.

2) NaCl: solubilities between alkaline earth metals and lead are different because all of the alkaline earth metals are soluble but lead is not.

3) NABr: solubilities between alkaline earth metals and lead are similar because all of the alkaline earth metals and lead are soluble.

4) NaI: solubilities between alkaline earth metals and lead are different because all of the alkaline earth metals are soluble but lead is not soluble but also yellow.

5) Na2SO4: solubilities of top two alkaline earth metals are different because top two are soluble but lead is not and solubilities of bottom two alkaline earth metals are similar.

6) Na2CO3: solubilities between alkaline earth metals and lead are similar since all of compounds show cloudy and solid.

7) Na2C2O4: solubility of top first alkaline earth metals is different from lead because top first compound is soluble but lead is not and solubilities of rest of alkaline earth metal is similar since those show cloudy and solid.

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Q: Compare the solubilities of the lead compounds with those of the alkaline earth metals How are the solubilities similar and different?
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