[romano]

I'm wondering what reaction will take place when lead sulfate is mixed with hydrochloric acid?  Will the chloride and sulfur form sulfur dichloride?

Does lead sulfate have a high (basic) pH? 


Thanks for any help on this. 

[vhpk]

Compare the solubility product of 2 substances above

[AWK]

Lead sulfate is poorly soluble in water (about 30 mg per liter). Addition of HCl, especially a concnetrated HCl increases solubility of PbSO4.
There are two equilibrium processes that can cause this change
H₃O⁺ + SO₄^2- = H₂O + HSO₄^-
Pb(HSO₄)₂ and PbCl₂ are much better soluble in water than PbSO₄ itself.
Moreover in a conc. HCl a formation of a complex anion PbCl₃^- should be taken into account, but the first reaction is much more important.

[vhpk]

Lead sulfate is poorly soluble in water (about 30 mg per liter). Addition of HCl, especially a concnetrated HCl increases solubility of PbSO4.
There are two equilibrium processes that can cause this change
H₃O⁺ + SO₄^2- = H₂O + HSO₄^-
Pb(HSO₄)₂ and PbCl₂ are much better soluble in water than PbSO₄ itself.
Moreover in a conc. HCl a formation of a complex anion PbCl₃^- should be taken into account, but the first reaction is much more important.

I think the forming of PbCl₄^2- is more feasible than the one you said

[AWK]

I think the forming of PbCl42- is more feasible than the one you said

This is a complex problem. pK₄ formation constant for PbCl₄^2- is 1.0 whereus pK₃ is 2.04. Its means that formation odf PbCl₄^2- is important only in concentrated Cl^- solution.