The Hydrolysis of the Hydrated Pb ion PboH aq H200SolutionP

The Hydrolysis of the Hydrated Pb ion PboH (aq) + H200

Solution

Pb(OH)₂ turns into an insoluble precipitate as the reaction moves forward.The solid precipitate is considered to be out of the solution(the system), so the reaction moves forward and Pb²⁺ concentration in the solution decreses.

When something soluble becomes insoluble, it is called a precipitate and the process/reaction is called precipitation reaction.

H+ is part of the product side.We know an reaction goes to other side if a reagent of one side is added.That is some of Pb(OH)₂ precipitate will convert back to PbOH⁺(aq).

As H⁺ increases pH decreases, so as pH increases H⁺ decrases and reaction moves in forward direction that is more of precipitate is formed.Opposite happens if pH decreases.

Comment if any doubt.